Explain the digest cycle in AngularJS.

To clarify, the digest cycle is a loop mechanism within AngularJS that checks for changes in the watch list — a collection of all the watches set up in the application. These watches track changes to variables or expressions bound to the scope. When a change is detected, AngularJS evaluates the watch expressions and updates the DOM accordingly, ensuring the view remains in sync with the underlying model data.

The process begins when something triggers a change, such as a user action, an AJAX call completion, or simply invoking $apply or $digest. AngularJS then enters the digest cycle, iteratively traversing through the watch list. For each watch, it compares the current value of the watch expression with the previous value. If...