Language

AL ist the proprietary programming language for the ERP System Microsoft Business Central 365. AL is event-driven, but not object-oriented. C/AL is one of the 4th generation programming languages. C/AL is syntactically related to Turbo Pascal, but does not have such a strict typing as Pascal.

Additional resources
E.g. The official website, documentation or language specification.

MSDN:
https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-get-started
https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-programming-in-al

Code samples:
https://github.com/microsoft/AL

VS Code Plugin with very good code highlighting:
https://marketplace.visualstudio.com/items?itemName=ms-dynamics-smb.al