For some trades we require a trading partner to be Paypal Verified. This helps us in establishing identity and avoiding scams or thefts. As the consumer, you want to be verified because it makes it harder for someone to hack your Paypal account or steal your identity.
The verification process varies from country to country. In the USA Paypal verification involves connecting a bank account, credit card or providing other information. Because banks have to screen their account holders, this increases the security of your account. It is like an extra set of eyes checking to make sure you are who you say you are.
If you have questions about Paypal Verification you can call Paypal directly at 888-221-1161 or go to the Paypal Website