Authentication is very important for both users and websites. It helps to keep users' information safe and also helps us to manage the accounts. Authentication is also complex because there is a lot of moving pieces that have to fit together in just the right way to make that work. The course introduce three tools to make authentication more quickly and safely. 1. Passport.js Passport.js will make our life easier and make our code shorter. It also helps to make implementation faster. Most importantly, it is used a lot in the real word. 2. Passport Local Passport Local is for username and password. It's about providing this entry point into all sorts of destinations. 3. Passport Local Mongoose This package will help us implement authentication with passport, and it's specially made to work with mongoose. We are also going to use these three tools into a Secret Page App project, which will show in next few posts.