What - ID Verification involves verifying the authenticity of the various forms of IDs submitted by the employee.
Why - An Identity Check is done to find out if they are who they say they are. There have been several cases of fake Ids that have come to light during this process. ID Verification can be done on all the ID cards issued by the Govt. Of India. This includes Pan Card, Driving License, Voter ID Card & Passport.
How - While some of these checks are conducted online, some have to be verified through a physical visit to the department concerned. For example - some Driving License verification may require a visit to the local RTO.