JSON Web Tokens (JWTs) are a popular and efficient method for secure information transmission between applications, commonly used for authentication and authorization in web development. JWTs consist of three main components: the header, payload, and signature, which together create a compact, self-contained token that eliminates the need for maintaining session information on servers. They support cross-domain usage, are ideal for mobile app authentication due to their size and stateless design, and can be encrypted for enhanced security. However, JWTs have limitations, such as vulnerability to replay and man-in-the-middle attacks if not properly secured, and are not suitable for transmitting sensitive information due to their lack of inherent encryption. Best practices for JWT implementation include securing secret keys, using HTTPS, choosing appropriate algorithms, and handling token revocation to optimize security and functionality. Descope offers tools to simplify JWT implementation with a user-friendly interface, enhancing both security and user experience in applications.