# Overview

Cornerstone's Core and HR APIs come in several varieties.

  1. Approvals - Enables developers to view, approve, and deny requests, as they appear on the user's Universal profile page.
  2. Employee API - Enables developers to view, create, and update employee records, custom fields, and CHR-specific attributes.
  3. OU API - Enables developers to fully view, create, and update OUs.
  4. Global Search API - Enables developers to search for people, training, and certification details.
  5. Other APIs - Use our Bulk, Reporting, or Data Exporter API frameworks to operate upon Employees, OUs, and Capabilities en masse. Details on these APIs are available under their respective guide pages.