Q.Open your internet browser and check the settings for cookies. Also, try to locate some cookie files on your computer system.

Think of a cookie as a small note that a website leaves in your browser so it can recognise you the next time you visit. You walk into a library, and the librarian remembers you borrow detective novels, so she quietly keeps a card with your name and your taste. That card is the cookie. It sits in your browser, not on the website's server, and every time you return to that site, your browser shows the card to the site so it can greet you appropriately.

The precise meaning: a cookie is a tiny text file that a website asks your browser to store on your device. It contains a few pieces of information — often a unique identifier, sometimes your preferences, login state, or items in a shopping cart. When you revisit the site, your browser sends that cookie back, and the site reads it to remember who you are and what you were doing. Without cookies, every page load would treat you as a complete stranger, and you'd have to log in again and again, or re-add items to your cart.

Why does this matter for you as a commerce or humanities student? Because cookies sit at the heart of how the internet does business. They power the "remember me" button, personalised recommendations, and targeted advertising. When a shop shows you "items you viewed recently," that's a cookie at work. When a news site remembers your language preference, that's a cookie too. They make the web feel personal and convenient.

But there's a trade-off. Cookies also track your behaviour across sites, building a profile of your interests, which advertisers buy and use to show you specific ads. This is why you sometimes see an ad for shoes you merely glanced at yesterday. That's not magic — it's a cookie (or a similar tracking technology) telling the ad network what you looked at.

Here are the main types you'll encounter:

• Session cookies — temporary, deleted when you close the browser. They keep you logged in while you browse, but vanish afterwards.
• Persistent cookies — stay on your device for days, weeks, or longer. They remember your login and preferences across visits. …