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In Spring Boot, caching can be implemented using the @Cacheable annotation. By annotating a method with @Cacheable, the result of the method will be cached and future invocations of the method with the same arguments will return the cached result instead of executing the method again. This can greatly improve the performance of frequently accessed methods. To configure the cache, you can use the @EnableCaching annotation in your application's configuration class. The most commonly used caching mechanism in Spring Boot is ___ caching.