TPM stands for Trusted Platform Module. It is a chip that is used as a security feature if you are using something like Bitlocker Encryption to secure your data. What it does is you can set your encryption so that it will deny access to the files if it doesn't detect your TPM. This helps prevent sensitive information from falling into the wrong hands if the hard drive is stolen, and the thief tries to access the drive on another computer.
If you aren't encrypting your data and using the TPM as an extra layer of security, you don't need it turned on. If you have encrypted your boot drive with Bitlocker encryption and are using the TPM for security, you will need it enabled for your computer to even boot up.
Thank you that helps! I won't be enabling it..