Why Are There 4 Wires In My Outlet

There are multiple wires because that is how wires are connected to gather to get from the distribution box to the farthest outlet on the circuit.
Why are there 4 wires in my outlet. The two bare copper ground wires help prevent accidental electric shock. Do the same with the white wires. Another is that the box is on a circuit three way switch loop. I have recently replaced all of the electrical outlets in my kitchen because i refurbished the whole kitchen.
And in the junction box some have 3 wires some have 2 wires and some have 4 wires. Well some of my outlets have grounded receptacles but no grounding wire. 1 black and 1 white. Basically a hodge podge of stuff here.
In most cases you see a red wire in an outlet box only in special circumstances. The red wire switched hot wire going to the outlet wires into the other side of the switch and the white wires neutral tie together to complete the return side of the circuit. Since there isn t even a ground wire available to fit the ground screw in the new outlet that means i have to figure out how those four wires get installed in an outlet with only two screws. It is tied together with a wire going to the switch and the black wire going to the outlet.
You can wire nut the black wires together with the black from your new outlet. Where there are not enough screws you attach the outlets together with a connector with an additional short pigtail that goes to the device. There is only a single ground wire in your picture i would look to make sure both grounds are wire nutted together in the box with a third the one in the picture going to the old outlet s ground. I connected the wires to the sockets the way that i thought i had.
Why do some of my kitchen outlets have 4 wires 2 black and 2 white and others have 2 wires. Most of the sockets have only a white wire black wire plus ground wire but four of the sockets in the kitchen have 4 wires white black red and ground. I ve figured out there are two holes for the hot screw and two holes for the neutral. The black wire hot wire coming in from the left is the source power.
There are two white neutral wires that also connect to the outlet from the main source and to another outlet. These four sockets have a trip breaker each at the fuse box. In standard 120 volt wiring the hot wire is black but it can also be red. So here s my questions.
Electrical outlets or receptacles allow you to connect an appliance to electrical wires inside your home. Electrical outlets in the united states come in 110 volt with three wires. Some outlets have just the two prong outlet. My boyfriend is currently puting in new 15a 125v gfci outlets in the kitchen.
My house was built in 1978.