# Materials for design and rendering
It is important to understand that there are two types of materials, layout materials, which are not ready for final rendering, and render materials, which are materials created for the engine Cycles.
Cycles is a rendering engine physics-based ray tracing. This engine simulates light bouncing off different surfaces as it would in reality. This is ideal for all those users who want to do render with realistic finishes of their projects.
As we can see in the top menu, in the Rendering tab, we can apply two types of materials.
When working we can use one material or another indistinctly, although it is much faster to work with design materials, thus avoiding the program having to constantly recalculate the variables, and slow down the process. When it comes to rendering, it is imperative that elements have a material suitable for Cycles applied. We can see the difference between them.
On the left we see the design materials, and on the right those applied for rendering (The models in the images are not rendered, they are samples of what we see while we work).
 
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