Comment by alysson_b4a

Parse.com was a BaaS(backend as a Service) acquired by Facebook in 2013. Using the platform was possible to build and host most of all your app backend(database, legacy code, integrations, Push notifications, send emails, social login, ...) and to integrate with your app front-end using the SDKs or even using a REST API. Parse Server is the open source version of Parse.com launched after the Parse shutdown announcement.