Broadly speaking modern browsers try to speed up the loading process, so when you visit the website for the first time your browser will 'save' pieces of the site site and store these. Because your browser can display the files stored in its cache much faster than it can pull fresh files from a server, the next time you visit that site, the use of cached files will help cut down page load time.
Sometimes the information stored in your browser's cache is inaccurate due to various circumstances and the outcome from the site is not as expected. Clearing temporary internet files (cache) will help to have a fresh start which means that some of the problems related to caching will be resolved instantly.
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