FR4 simply put, is a composite material grade designation for PCB’s. FR stands for “flame retardant” and FR-4 is known for being self extinguishing. As electronics become smaller and smaller today, what matters most is that your item offers superior performance for the duration of its expected lifespan. When selecting PCB board materials, quality is most important whether it's intended for use in home electronics or industrial equipment.
The great thing about FR-4 is the insulating qualities in both dry and humid conditions. If you combine that with great fabrication, you can have a wide variety of electrical and mechanical applications.
Altium gives you many options for PCB fabrication such as:
Single sided board: Conductors on one side
Double sided board: Copper traces on both sides
Silk screen layers: When visible information is needed on a PCB
Multi-layered board: Offer much denser routing topologies
Download a free trial of Altium Designer and see how many options of PCB manufacturing you have when choosing to use FR4 material.