Promise chaining is a technique in JavaScript where multiple asynchronous operations are linked together using .then() blocks, so the output of one Promise becomes the input for the next. In this example, first() checks age, second() determines access level, and third() confirms access — all handled cleanly without nesting, with centralized error handling using .catch(). For more interesting posts, follow @serviceour24 ... #techTok #developer #coding #viralvideos #foru #fyp