The main reason for resetting a tablet is when it is being resold. Tablets that have started to perform slowly are also often reset to get them running normally again.
A reset on a tablet restores it to its factory settings. In essence, this means it will be in the same state that it was in when it was first purchased. Things like installed apps, documents, accounts, passwords and other data are all erased. Only the operating system and the apps originally loaded on the device will remain. It is therefore a necessary process when selling a tablet, as it removes all data and information relating to the original user. But this is not the only reason.
Over time, some tablets can start to run slowly. This is often caused by having too many apps, files and accounts. They fill up the tablet and lower the level of its performance. A reset will get the tablet back to its original condition. The downside is that all data, accounts and apps are deleted.
The process of resetting a tablet is not complicated, and it can be done by most people, even those without technical knowledge. However, it is a process that takes time.