For a long time, Android users have struggled trying to find ways to allow them to make your smartphone out faster, which now is no longer necessary, but that it has left many customs. One of them might not be so good, and it's clear the cache regularly. These data are necessary.
What is the cache? Briefly, we will say that the cache is an auxiliary memory, high speed, which is made for copying some files or data that need to access the system quickly. This data could be stored in the main memory of the mobile or online. But the cache is made so that the copy is made to this specification and can be operated with them in a simpler and more logical way. To understand it, it's like a chef moves to a lettuce cutting board to be chopped. You could cut the lettuce itself in the place where it was, but it is much more comfortable or effective for the cook take up the most accessible and prepared place. That's the cache. What happen? Well, when we have freshly cut lettuce, and no longer need the lettuce, we can remove that site out of the way. It is equivalent to clear the cache. By freeing memory, also we speed up the smartphone in a certain way.
However, the cache is made for something. If we erased when the system is using, it would be like trying to move the lettuce cutting board halfway through the process of hashing. Chances are that the hashing go wrong. If you delete the cache when the phone is using it, we interrupt that process.
But it is more, clear the cache has more risks. Some applications may use data cache for faster operation, or simply to avoid having to download them from elsewhere. This is what happened to Google+, which has caused many users to spend gigas data in a few hours. Google+ has had a failure, but many users were active systems that blotted cache periodically. Google+, losing the data was cached, the download again. And again, they returned to be deleted, making a lot of megas be spent. The cache is for something, and this is an example.
Delete or delete? The recommendation is to not do it regularly. The cache is essential in any system, and its operation is usually good. In Android, it is getting better, and we can not expect that this is making our mobile go slow. If we must still clear the cache every so often, what we recommend is that do not be an automatic deletion. It is better than erasing the realicéis by a button that you can activate. That way, you will know at all times what the phone is doing, and you avoid such problems, such as Google+, which produces a very noticeable battery drain and data traffic rate.