# Sections

> Sections are the reusable content modules merchants arrange in the Shoplazza theme editor. Start here for section schema, section assets, and app blocks.

Sections are reusable, customizable modules of content that merchants can add to templates and arrange in the theme editor.

For a full introduction, see the [Sections overview](/docs/theme/architecture/sections/overview).

## Topics

- [Overview](/docs/theme/architecture/sections/overview): What sections are, how they render, and where they live
- [Section schema](/docs/theme/architecture/sections/section-schema): Define settings, blocks, and presets for sections
- [Section assets](/docs/theme/architecture/sections/section-assets): Include CSS and JavaScript specific to a section
- [App blocks](/docs/theme/architecture/sections/app-blocks-for-themes): Allow apps to inject content into sections