Every charge creates an electric field. The field E at a point is the force a tiny positive test charge would feel there, per unit charge. Field arrows point away from positive charges and toward negative charges, and field lines connect them, giving a visual map of the force field.
Electric fields around chargesCoulomb's law F = k · q1 · q2 / r²
Field strength E = k · |Q| / r²
Potential V = k · Q / r
Superposition E_total = E1 + E2 + ...
Superposition
Every charge contributes its own field independently, and the total field at any point is the vector sum. This is what lets you build complex fields from simple charges.