A coulomb is the standard unit for electrical charge and represents approximately 6.242 x 10^18 elementary charges (like electrons or protons).
Imagine a huge stadium filled with people. If each person represents an elementary charge, then the entire stadium full of people would represent one coulomb.
Elementary Charge: This is the smallest unit of electric charge that any particle can have, like how each person in our analogy is the smallest part of the crowd.
Electron: An electron carries a negative elementary charge. It's like one person in our stadium who supports the opposing team.
Proton: A proton carries a positive elementary charge. It's like one supporter for your home team in the stadium.
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