What is the difference between a shaving razor and a hair razor comb?

because i want to fix my bangs a little bit, i think my sister got me a razor comb for my birthday.. can someone tell me the difference?|||Razor Hair Comb is a handy tool for trimming between salon visits. The safely shielded razor protects fingers, scalp, and neck while you trim and makes home styling simple to keep you well groomed.