What do you mean by Testing & Verification

Testing is a process to determine the presence of faults (not the absence of faults) in a given circuit,whereas Verification is the process to determine the correctness of a design i.e whether the design is working correctly or not.
Some other differences are as below

Testing	Verificataion
Testing verifies the correctness of manufactured hardware i.e gate level circuit	Verification verifies the correctness of a design i.e design is working perfectly or not
In Testing we have a hardware on which we can apply inputs & observe the output	Whereas Verification works on a design which is on paper
Responsible for quality of a devices	Responsible for Quality of a design

Performed on every manufacture devices

Performed only once prior to manufacturing

Testing can be done at below level

• Chip level
• Board level
• System level

As we go down the hierarchy level the cost of testing is going to increase by 10 times,so its better to do testing in early stages of a design.

One point to be noted that no amount of a testing gives us a guaranty that a circuit is fault free,the more we test the more confidence we get about for proper working of circuit.