This page contains a list of the Drupal 8 core and most significant contributed modules that are related to upgrading to Drupal 8. Core Migrate modules Please refer to Migrate API overview for technical documentation of core features. Migrate Provides the underlying API for migrating configuration and content to Drupal 8. The migration source may be a different system altogether.
Source: Drupal 8 migrate modules | Drupal 8 guide on Drupal.org