Critical to nearly every application we build is some type of authentication and user identification. Usually, we will spend days and weeks developing an accounts system, when we could spend that time programming our app. Meteor solves this problem, and solves it well. From integrations with major OAuth providers (Twitter, Google, Facebook, etc.) to a simple, secure password-based system, adding accounts and authentication inside of your Meteor app is quick and painless. The recipes in this chapter will cover the most important aspects of Meteor's accounts packages, enabling you to easily take care of user accounts and move on to other things.