Vises come in a range of sizes and configurations, optimized for metalworking, woodworking, and a variety of specialty tasks. Depending on your shop activities, you'll probably need more than one. These videos show a good sample of what's available:
Homemade milling machine vise by mmcristi1981
How To Make MINI VISE simple by Creative Channel
Building Homemade Vise For Workbench by Victor V.
how to make a moxon vise by The WoodWorking Junkie
homemade engraving vise by MaTchBoOkPoEt
Quick DIY Leg Vise by Curt Filipowski