In Angular, interceptors and guards tackle cross-cutting issues at various levels and for different objectives.

Interceptors
Interceptors in Angular are used to intercept and modify HTTP requests and responses.  Interceptors They let you to add authentication tokens, manage errors, modify request headers, cache responses, and more tasks like .: 

• Add headers (e.g., authentication tokens).
• Logging requests, responses.
• Global error handling.
• Cache replies.
•  Transforming requests/responses.

 

HTTP Interceptors are a middleware technique that can intercept HTTP requests and responses and are part of the Angular HttpClient module. Interceptors operate at the HTTP level, affecting all HTTP communication within the application. You to intercept HTTP requests and responses, both inbound and outbound

 

 

Guards 

Guards in Angular manage route navigation. They determine if a route or module is accessible. There are several types of guards:

• CanActivate: Decides if a route can be activated.
• CanActivateChild: Decides if a child route can be activated.
• CanDeactivate: Decides if a user can navigate away from a route.
• CanLoad: Decides if a module can be loaded.
• Resolve: Fetches data before a route is activated.

 

Difference between both

• Scope: Interceptors scope is limited to HTTP requests and responses where as guards do Route navigation
• Purpose: Interceptors are generally used to Modify or augment HTTP communication   where as Guards Control access to routes
• Use cases: Interceptors  used for Authentication, logging, error handling, caching  Where as Guard is generally used for Authentication, authorization, preventing navigation
• Execution: Interceptor execute For every HTTP request/response Where as Guard executes When navigating to a route