What is a .txt?

[Sergei Popov]

A cluttered phone bugs me. I go to the app My Files, click Documents and all I see are:
[series of numbers].txt

Two questions:
1. What are they?
2. What happens if I delete them

 

[hallux]

They are plain text files. Think Notepad on a Windows computer. No formatting, just the text.

What happens if you delete them? Probably nothing, but don't quote me on that.