In Salesforce, custom automated processes often need to generate formatted summaries—such as tables, styled headings, or colored lists—directly inside a Rich Text Area field. Populating rich text fields via Apex code allows you to store pre-formatted HTML data directly on a record. This formatted content can then be reused seamlessly inside standard Salesforce email templates without needing complex template code. In plain words: You can construct raw HTML strings in your Apex code and assign them directly to a Rich Text Area field on any record. When saved, Salesforce renders the underlying HTML as styled text, tables, and lists in the UI and email merge fields.
Apex Code
Email Templates
HTML in Salesforce
Lightning Web Components
Rich Text Area
Salesforce Developer