Why does my iPhone keep a history of everything I do?

I really dislike this. When I slide my screen to the left for the search bar to open up if I put in one letter it will bring up my entire phone history that has that letter even old texts or contacts that are deleted. Can I turn this feature off? I don't want it at all

Added (1). I've cleared the history but that only clears the internet browsing history not the history of the phone including texts/contacts etc.

Unless I don't know where the feature to clear that info is - Reason why I asked this question.

Added (2). So if you'd care to enlighten me on how to clear that info it'd be appreciated even with your foul mouth.

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