Description: Navigation Guards in Vue Router are functions that allow controlling access to routes within a web application built using Vue.js. These functions are essential for managing navigation and ensuring that users have the appropriate permissions to access certain sections of the application. Guards can be used to authenticate users, redirect to specific pages, or prevent access to unauthorized routes. They can be implemented at the individual route level or globally, providing flexibility in navigation management. Additionally, guards can be asynchronous, allowing for checks that require time, such as API calls to validate credentials. In summary, navigation guards are a powerful tool for enhancing security and user experience in web applications, allowing for more granular control over how and when users can access different parts of the application.