Register vs Flip Flop

Register:

A register is a storage device capable of holding binary data.
It is a temporary storage area.
Flip-flop is a 1 bit memory cell which can be used for storing the digital data.
To increase the storage capacity in terms of number of bits, we have to use a group of flip-flop. Such a group of flip-flop is known as a Register.
A register is a set of flip-flops with combinational logic to implement state transitions that allow information to be stored and retrieved from them.
The output is based on current input and previous output and change of state can happen at any time when its input change.
To store N bits, a register must have N flip-flops, one for each bit to be stored.

For example, the 4-bit register is implemented by four D flip-flops.

The input CLK comes from an AND gate that puts out the logical AND of the system clock and the LOAD signal.
When LOAD is 0, the flip-flops are cut off from the input and do not change state in response to the input.
The design calls for LOAD to be 1 for almost one clock pulse, so that the system clock and LOAD are both high for 1/2 clock cycle. At this time, the register is loaded.

Applications:

It is used to interface digital systems
It can be used as simple delay circuits.
They can be used to convert serial data to parallel data commonly in microprocessor based system.
It can be also used for multiplication by shifting left and division by shifting right.

Flip Flops:

A flip-flop or latch is a circuit that has two stable states and can be used to store state information.
The two stable states are High (logic 1) and Low (logic 0).
These are a binary storage device because they can store binary data (0 or 1).
Flip flops are also used to control the digital circuit’s functionality. They can change the operation of a digital circuit depending on the state.
The output is based on current input and previous output and change of state will occur specific times depends on clock input.

Applications:

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