You said you use this for ROT13ing things. How does that work? Suppose I wanted to make a Facebook post that gave my friends the option of knowing Obama is a werewolf, but also gave them the option for them not to know this if they'd rather be surprised later.
The Chrome plugin I linked to lets you carry out basic encoding functions in the browser, which includes stuff like rot13, URL-safe strings, a couple of hashing functions, etc.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.