Final answer:
Apex is a programming language used with Salesforce API to execute queries and perform other operations.
Step-by-step explanation:
Apex is a strongly-typed, object-oriented programming language used in conjunction with calls to the Salesforce API. It allows developers to execute queries on Salesforce servers, retrieve data, and perform other operations.
For example, developers can write Apex triggers to automate business processes and perform actions like inserting or updating records in the database. They can also create workflow rules to automate standard internal procedures and processes, and use Visualforce Pages to build custom user interfaces.