Your NetID is for your exclusive personal use. It is a violation of Network Usage Policy to share your NetID and password. If someone has your NetID and password, this person can look up or change personal and confidential information about you, including your benefits package, tax information, grades, address, email account, and emergency contact information.
You are the only person who should ever use your NetID and password. Likewise, you should never use anyone else’s NetID and password, even if the owner says that it is okay.