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Firebase is a popular tool that helps you build apps fast, without managing infrastructure. It offers lots of services to help your app grow. It's built on Google infrastructure and can scale automatically, so you don't have to worry about scaling your own servers.
It includes a powerful Database as a Service solution which provides a scalable NoSQL cloud database to store and sync data for client and server side development. Firebase has a freemium model (start for free, then pay as you go) and is not open source.
Popularity for Firebase in Ionic and Angular apps has increased a lot in recent years. And this is mainly because it's very easy to integrate and it provides useful out of the box solutions such as Authentication, Database access, File Storage, Push Notifications, Hosting and, many more.
The following tutorials include different examples of Firebase Integration in Ionic Framework apps such as social authentication, CRUD, hosting and file storage. Using them you can build a production ready app very quickly.