Answer: In a series circuit, the same amount of current flows through all the components placed in it. For example, the circuit is shape as a square, on the first side you would have your switch, and maybe the 2nd and 3rd have a lightbulb or something like that. In parallel circuits, the components are placed in parallel with each other due to which the circuit splits the current flow.
Step-by-step explanation:
Good image explanation from a website called "The Spruce"