What term is used for a web page developed using HTML and Apex code in Salesforce?

The correct term for a web page developed using HTML and Apex code in Salesforce is Visualforce page. Visualforce is a framework that allows developers to create user interfaces for Salesforce applications by using a combination of HTML, standard components, and Apex controllers. It enables the embedding of dynamic content, provides more control over the layout, and allows for the creation of complex UI elements that can interact directly with Salesforce data.

This framework is particularly valuable for building custom user interfaces that need to reflect real-time data and perform operations on Salesforce records. Visualforce pages can be customized extensively, and they can include standard or custom components to enhance their functionality and presentation.

In contrast, other options like Apex pages, Lightning pages, and HTML components do not specifically represent the combination of HTML and Apex in the same way. Apex is a programming language in Salesforce, while Lightning pages relate to Salesforce's newer Lightning Experience user interface, which uses a different architecture (Lightning components). HTML component is a more general term and doesn't define a specific Salesforce feature. Thus, Visualforce page is the precise label for the context of this question.