What is the primary purpose of cookies in web development?

Cookies are small pieces of data stored on a user's computer by the web browser while browsing a website. They are primarily used to track user behavior, preferences, and sessions. By storing information such as user preferences, login status, and items in a shopping cart, cookies enhance user experience by personalizing content and remembering past interactions. They enable websites to recognize returning users and provide a more tailored experience. Understanding how cookies work is essential for web developers, as they play a crucial role in maintaining user sessions and personalizing web applications. Option A (To store files) is incorrect because cookies do not store files but rather small data values. Option C (To enhance webpage loading speed) is misleading; cookies do not directly affect loading speeds but can impact user sessions. Option D (To secure data transfer) is incorrect; while cookies can have secure flags, their primary role is not for data security. Option E (To format text) is also incorrect as cookies do not influence text formatting on web pages.