_______ are used to identify a user who returns to a website.

Question

Accepted Answer

The correct option is (4):
The correct answer is Cookies. Cookies are small, passive text files that a website stores on a user's computer or web browser. The primary purpose of a cookie is to assign a unique session or client ID to the user during their first visit. When the user returns to the website at a later time, the browser automatically sends this stored cookie back to the web server. By reading the unique identifier contained within the cookie, the server is able to recognize the specific visitor as a returning user, maintain their logged-in state, remember site preferences, or retrieve information about their past activity, thus providing a continuous and personalized browsing experience.

The incorrect option is (1):
Blogs are websites or online platforms that focus on publishing and managing written content, news, or articles, often in a journalistic or informal style. They are a form of content presentation and consumption. While blogs may *use* cookies to track visitors, the blog itself is a content management system or a collection of posts, not the underlying technical mechanism used to identify a returning user across sessions. Their function is communication, not client-side data storage for identification.

The incorrect option is (2):
Identifiers is a general term used in computer science for any name or label that is used to uniquely identify an entity, such as a variable, a function, or a user. While a cookie *contains* a unique user identifier, the word "Identifiers" is too broad and conceptual to describe the specific web technology and data storage mechanism that enables a server to persistently track a user across separate visits. The cookie is the mechanism, and the unique ID is the data it holds.

The incorrect option is (3):
Scripts are programming code, typically written in a language like JavaScript, that run in the user's web browser to control the behavior of the webpage. Scripts are active instructions that execute logic and create dynamic functionality. Although a script can be used to read or set a cookie, the script itself is the execution engine or the set of instructions, not the small data file that serves as the persistent token for user identification. The script facilitates the use of the cookie, but the cookie is the actual identification data.