Entities
An entity is represented by <a-entity>. It is the core building block that comprises everything within a scene.
A-Frame includes a number of entity types that extend on <a-entity>, including:
<a-box><a-camera><a-cylinder><a-image><a-light><a-plane><a-sky><a-sphere>- And many more
Using a primitive you can easily, for example, create a box:
<a-box color="red" depth="2" height="2" width="2"></a-box>
This will produce a red box:
