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The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
JPA is an API for talking to SQL databases and mapping SQL tables to Java classes. You mentioned being familiar with Entity Framework, JPA is somewhat similar. In Java it is more common than in C# to have a specification for something, and then a number of implementations of that specification. JPA is the specification, https://hibernate.org/ is one of the implementations of that spec. If you know you're going to work with SQL databases, it might make sense to look into Hibernate. If you end up using something else, it is likely a lot of the concepts will transfer over.