Arduino Micro Pins

New to a lot of the Arduino hardware, and I was trying to figure out, what exactly is a vcc pin? some arduino's have it labeled some don't. Do the ones that don't have it labeled not have it? the arduino micro for example doesn't have it labeled on the board, but in the schematics it is clearly there. the arduino mini has it labeled on to different pins...what is the difference? does the micro have one? i need help!

Thank You, Alex Valente Dos Pueblos Engineering Academy Class of 2015