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title: Appendices
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# Appendices

- **[Global Variables, Functions, and Expression Operators](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages/variables/pages-variables.md)**


    Visualforce pages use the same expression language as formulas—that is, anything inside `{! }` is evaluated as an expression that can access values from records that are currently in context.

- **[Security Tips for Apex and Visualforce Development](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages/security/pages-security-tips-intro.md)**


    The powerful combination of Apex and Visualforce pages allows Lightning Platform developers to provide custom functionality and business logic to Salesforce or to create a new standalone product running inside the Lightning Platform.

- **[Apex Classes Used in Visualforce Controllers](https://developer.salesforce.com/docs/platform/salesforce-pages-developers-guide/guide/pages/apex/pages-apex.md)**


    This appendix includes information about the system-supplied Apex classes that can be used when building custom Visualforce controllers and controller extensions.