What is the difference between vulnerability assessment (VA) and penetration testing (PT)?

Vulnerability Assessment (VA)	Penetration Testing (PT)
Identifies the vulnerabilities in a network	Identifies vulnerabilities to exploit them to penetrate the system
Tells how susceptible the network is	Tells whether the detected vulnerability is genuine
Conducted at regular intervals when there is a change in the system or network	Conducted annually when there are significant changes introduced into the system