A series circuit has only one path for the current to flow through, whereas a...

Resistors are connected in series, one after the other, as depicted in the diagram. Here, resistor R1 has one end linked to point A and the other to resistor R2. The resistors R2 and R3 are also linked together in series. Since the current must pass through each resistor, there is only one path for it to take in this situation.
The resistors are linked in parallel to one another in the parallel connection, as depicted in the picture. At point A, the main current (I) from the source separates into several arms. More current flows via the less-resistive arm whereas less current does so through the more-resistive arm. As a result, there are numerous channels for current to flow through in a parallel circuit.