In terms of functionality, there are a few things that Apex and Visualforce have in common. Both allow you to build custom user interfaces, and both have tools for making calls to the Salesforce API. However, there are some key differences between the two platforms.
For one, Apex is a programming language, while Visualforce is a markup language. This means that Apex is more powerful and flexible than Visualforce, but also more complex. Visualforce is easier to learn and use, but it is not as robust.
Another key difference is that Apex code is executed in the Salesforce environment, while Visualforce code is executed in the user's browser. This means that Apex code has access to all of the Salesforce data and functions, while Visualforce code is limited to what is exposed to the user.
Finally, Apex code is compiled and executed on the Salesforce servers, while Visualforce code is interpreted and executed on the user's browser. This means