Session management is a crucial aspect of web applications that helps track user interactions over time. When a user logs into a website, a unique session is created to remember their preferences and activities. This allows the application to provide a personalized experience, such as keeping items in a shopping cart or maintaining user authentication without requiring repeated logins. Effective session management also involves security measures to protect user data. This includes techniques like session timeouts, which automatically log users out after a period of inactivity, and secure cookie handling to prevent unauthorized access. By managing sessions properly, developers can enhance both user experience and security in their applications.