Cookies (Cambridge International IGCSE Computer Science)
Spec point —
5.1.6· "6 Explain what is meant by cookies and how they are used, including session cookies and persistent cookies"
Cookies
What is a cookie?
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A cookie is a tiny data file stored on a computer by browser software that holds information relating to your browsing activity
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Typically a cookie will contain:
- Browsing history - what websites you have visited
- Login information - usernames & passwords
- Preferences - language/font size/themes
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The two types of cookie are session cookies and persistent cookies
Exam Hint Cambridge IGCSE 0478 expects you to describe the purpose of cookies, differentiate between session and persistent types, and explain the legal requirement for user consent. This page covers exactly what examiners test, no extra fluff.
Session cookies
- Stored in RAM
- Created each time a user visits a website
- Automatically deleted when the browser is closed
- Used to track activity during a single browsing session, such as items in a shopping basket
Persistent cookies
- Stored on the hard drive
- Created the first time a user visits a website
- Remain on the device until they expire or are manually deleted
- Used to remember login details and user preferences across multiple visits
| Session cookie | Persistent cookie | |
|---|---|---|
| Where stored | RAM | Hard drive |
| When deleted | When browser is closed | When expired or manually deleted |
| Purpose | Track current session activity | Remember preferences and login details across visits |
Exam Hint Examiners are looking for what cookies do, not whether you think they are good or bad. Focus on their purpose: storing login info, preferences, and session data, not "tracking users" or "spying." When asked to compare the two types, always reference where they are stored and when they are deleted as these are the details that earn marks.
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