Apex is a strongly typed and object-oriented programming language that permits developers to execute flow and transaction control statements on Salesforce platform servers in conjunction with calls to the API. It uses syntax that looks similar to Java and pretends like database stored procedures.
Apex allows developers to add business logic to many system events, including Visualforce pages, button clicks, and related record updates. This code can be initiated by requests from web services and from triggers on objects.
All Apex code runs completely on-demand on the Lightning platform. Apex code is written and saved to the platform by developers. Through the user interface, end-users trigger the execution of Apex code.
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