Ultrafuse® PLA (previously Innofil3D PLA,  different name, same high-quality product!) is Poly-Lactic-Acid, a biodegradable polymer with a low melting point.
It is an easy material to print with and Ultrafuse PLA gives a smooth printing result.
This most used 3D printing material is available in a wide range of RAL colors and translucent variants.

When properly cooled, PLA has a higher maximum printing speed, lower layer heights, and sharper printed corners.

Combining this with low warping of the print makes it a popular plastic for makers, prosumers and schools.