Idempotency is a computing principle where multiple applications of a function or operation produce the same result as a single execution. Web developers use idempotent methods to ensure processes don't repeat beyond the initial execution. By ensuring that multiple executions yield the same results, these methods allow a server or program to ignore redundant requests, preventing unnecessary duplicates or repeated operations. 

For example, consider the "double tap to like" feature on Instagram, where tapping a post twice quickly allows you to like it. When a user double-taps a post, Instagram’s server receives a request to increase the likes count for that post. This operation is idempotent — double-tapping repetitively won’t cause the like count to increase beyond the initial increment. Despite repeated user action, the browser’s HTTP idempotent method keeps the end result consistent. 

Idempotency is a core principle in maintaining data integrity and predictable functionality in web and software applications. It helps prevent inconsistencies and errors arising from repeated function calls or operations to ensure a smoother user experience. 

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