ELI5: Locator for information related to ISIS, after the attacks in Paris, and the ongoing war in Syria

We have been seeing a lot of questions about ISIS that are not concepts, but requests for answers. This post will serve as a helpful locator for many common questions.

Background on the ISIS/ISIL/Daesh

• https://en.wikipedia.org/wiki/Islamic_State_of_Iraq_and_the_Levant

Why do people join ISIS?

• https://www.reddit.com/r/explainlikeimfive/search?q=join+isis&restrict_sr=on

Why doesn't the US/UN/NATO/Russia bomb ISIS?

• https://www.reddit.com/r/explainlikeimfive/search?q=bomb+isis&restrict_sr=on&sort=relevance&t=all

Why is DAESH offensive to ISIS?

• https://www.reddit.com/r/explainlikeimfive/comments/3t6qvk/eli5_why_is_daesh_offensive_to_isis/

General questions on Daesh and ISIS

• https://www.reddit.com/r/explainlikeimfive/search?q=Daesh&restrict_sr=on&sort=relevance&t=all

• https://www.reddit.com/r/explainlikeimfive/search?q=isis&restrict_sr=on&sort=relevance&t=all

Other subs that discuss ISIS

• https://www.reddit.com/r/OutOfTheLoop/search?q=isis&sort=new&restrict_sr=on

• https://www.reddit.com/r/answers/search?q=isis&sort=new&restrict_sr=on

• https://www.reddit.com/r/politics/search?q=isis&sort=new&restrict_sr=on

• https://www.reddit.com/r/worldnews/search?q=isis&sort=new&restrict_sr=on