What is a common use of cookies in web interactions?

What is a common use of cookies in web interactions?

• A. Encrypting the data on a page.
• B. Maintaining login state across pages.
• C. Resolving DNS queries.
• D. Sending emails.

Answer: (B)

Cookies store small bits of data in your browser to help a site recognize you as you move from page to page. The common use is maintaining login state across pages: after you sign in, a session token is saved in a cookie. As you navigate, the browser sends that token with each request to the same site, so the server knows who you are and keeps you logged in without asking for your credentials again. This makes it possible to move through a site—viewing your account, your cart, or your dashboard—without re-entering your password each time. Other options aren’t the same role: encrypting data on a page is handled by the secure connection (HTTPS), DNS resolution is a network function, and sending emails is done by mail servers, not cookies.

Cookies store small bits of data in your browser to help a site recognize you as you move from page to page. The common use is maintaining login state across pages: after you sign in, a session token is saved in a cookie. As you navigate, the browser sends that token with each request to the same site, so the server knows who you are and keeps you logged in without asking for your credentials again. This makes it possible to move through a site—viewing your account, your cart, or your dashboard—without re-entering your password each time.

Other options aren’t the same role: encrypting data on a page is handled by the secure connection (HTTPS), DNS resolution is a network function, and sending emails is done by mail servers, not cookies.