Website cookies are small text files that get saved to your browser when you visit a site. Every time you return, your browser sends those files back, so the site can remember who you are. That is how your shopping cart stays full between pages, how you stay logged in without entering your password again, and how a site greets you with your saved language preference.
If you have ever wondered what are website cookies and why every site seems to ask about them, this guide explains it plainly.
How Website Cookies Work
When you load a website, the server sends a tiny data file to your browser along with the page. Your browser stores that file locally on your device. Every subsequent request to that site includes the cookie, so the server can identify your session and pick up where you left off.
Cookies cannot run code or access other files on your computer. They are passive text files, nothing more. The browser controls when they are sent and when they expire.
- Name: what the cookie is called, for example “session_id” or “cart_token”
- Value: the data stored, usually a random string that matches a record on the server
- Domain: which website the cookie belongs to and can be sent to
- Expiry date: when the browser should automatically delete the cookie
- Secure and HttpOnly flags: settings that restrict how the cookie can be accessed, adding a layer of protection
Types of Website Cookies
Not all cookies do the same job. They get grouped by purpose, and knowing the difference matters when you are deciding what to enable on your own site, or what to accept on someone else’s.
- Session cookies last only as long as your browser is open. They handle things like keeping you logged in during a single visit and are deleted automatically when you close the tab.
- Persistent cookies remain on your device until their expiry date. They remember your preferences, like your selected language or region, so you do not have to set them again on your next visit.
- Strictly necessary cookies keep the core functions of a site working, such as secure login and checkout. These cannot be turned off without breaking the site.
- Functionality cookies enable extras like live chat widgets, video players, and saved form data.
- Analytics cookies gather data on how people use the site, which pages they visit, how long they stay, and where they drop off.
- Marketing cookies track browsing across multiple sites to serve targeted ads. These are the ones that tend to raise privacy concerns.
First-Party vs Third-Party Cookies
Cookies do not always come from the site you are visiting. Some are placed by external services running on that page, like an ad network, a social media button, or an embedded video. That distinction matters for privacy.
| Cookie type | Where it comes from | Common uses | Blocked by most browsers? |
|---|---|---|---|
| First-party | The site you are visiting | Login sessions, shopping carts, saved preferences | No |
| Third-party | External domains (ad networks, social platforms) | Cross-site tracking, retargeting ads, embedded content | Yes, increasingly |
Third-party cookies are being phased out across major browsers. Safari and Firefox already block them by default. Chrome has been working on privacy-preserving alternatives, though the timeline has shifted several times. For most small business websites, this change mainly affects advertising campaigns that rely on retargeting.
First-party cookies
Set directly by the site you visit. They are generally considered low-risk because they only send data back to that same site, and they are essential for basic functionality.
Third-party cookies
Set by external services loaded on the page. They can track your activity across many different sites, which is why they are subject to stricter regulation and browser restrictions.
What Information Do Cookies Actually Store?
Cookies do not store passwords in plain text and cannot access files on your device. What they store is much simpler: small identifiers and preferences that help a site recognise you without making you start over each time.
A shopping site, for example, uses a cookie to store a reference number that points to your cart in the server’s database. The cookie itself does not hold your cart items. It just holds the key that unlocks them.
- Session identifiers that match you to an active login on the server
- Shopping cart tokens that keep your selected items between page loads
- Language and regional preferences so the site shows the right currency and content
- Analytics identifiers that count you as a unique visitor over time without recording your name
- Ad tracking IDs used by marketing platforms to recognise you across different websites
The Office of the Australian Information Commissioner notes that cookies can constitute personal information when they are linked to an identifiable individual, which is why Australian businesses need to handle them carefully.
Are Website Cookies Safe?
Cookies cannot carry viruses or run code on your device. By themselves, they are harmless text files. The concern is not what they are, but how the data they contain gets used, and who gets access to it.
Worth knowing: Third-party marketing cookies can build detailed profiles of your browsing habits across many sites, even ones you only visited once. That is the main reason privacy laws now require websites to tell you which cookies they use and give you a real choice about non-essential ones. At KC Web Design, every site we build includes a proper cookie setup from day one, not something bolted on later as an afterthought.
Risks that do exist include session hijacking, where an attacker intercepts a cookie value to impersonate a logged-in user, and cross-site scripting, where malicious scripts attempt to steal cookie data. These are not theoretical: they are real attack vectors that proper cookie configuration (using Secure and HttpOnly flags) helps prevent.
How to Manage Your Cookie Settings
You can view, delete, and control cookies in any major browser. Most people never touch these settings, but knowing where they are is useful when a site behaves strangely or you want a clean slate.
- Chrome: Settings > Privacy and security > Cookies and other site data
- Safari: Settings > Privacy > Manage Website Data
- Firefox: Settings > Privacy and Security > Cookies and Site Data
- Edge: Settings > Cookies and site permissions > Manage and delete cookies
Deleting all cookies will log you out of every site and clear any saved preferences. A more targeted approach is to delete cookies for specific sites, which most browsers support. The MDN Web Docs have a thorough technical reference if you want to understand exactly what each browser setting does under the hood.
What Are Cookie Consent Banners?
Cookie consent banners are the notices that appear when you first land on a website, asking whether you accept cookies. They are not just a design trend. In many countries, they are a legal requirement, and Australia is catching up.
Australian Privacy Act: The Privacy Act 1988 and the Australian Privacy Principles cover how businesses collect and handle personal information. If your website uses analytics or marketing cookies that can identify individuals, disclosing this is part of your obligations. The Government’s review of the Privacy Act is tightening these rules, bringing them closer to the EU’s General Data Protection Regulation standard.
A proper cookie consent setup should let visitors accept all cookies, reject non-essential ones, or make specific choices by category. A banner that only has an “Accept” button does not meet the bar in most modern privacy frameworks.
- List which cookie categories your site uses (necessary, analytics, marketing)
- Give visitors a genuine way to decline non-essential cookies
- Record consent so you have a log if it is ever questioned
- Link to your privacy policy and cookie policy directly from the banner
- Let visitors change their preferences at any time, not just on first visit
Does Your Website Handle Cookies Properly?
Most small business websites use at least a few cookies, even if the owner does not realise it. Google Analytics sets them. Contact forms often set them. Embedded maps and social share buttons can set them. The question is not whether you have cookies on your site, but whether they are set up correctly and disclosed honestly.
Understanding what a website is and how it handles visitor data is increasingly part of running a business online. A site with a cookie banner that does nothing, or analytics cookies running without disclosure, is a liability, not just an oversight.
- Audit what cookies your site actually sets, tools like browser dev tools or a cookie scanner can help
- Check your privacy policy includes a section on cookies and data collection
- If you use Google Analytics, make sure your consent banner blocks it until the visitor agrees
- Work with your web designer to implement a consent management platform if your site collects data at scale
If you are building a new site or reviewing an existing one, it pays to get this right from the start. The team at KC Web Design works with Australian businesses to build websites that are not only well-designed but properly set up with hosting, domain management, and privacy considerations built in. If your site needs a proper review or a fresh build, get in touch and we can walk you through what is actually on your site and what needs to change.
You might also find it useful to read about what a website domain is and how your website is put together, since cookies are just one piece of how the whole system fits.
