A security freeze puts a lock on your data at consumer reporting agencies. This means that you,or anyone else, can't open a new account while the freeze is on. If you, need to apply for a new account, you can temporarily lift the freeze.
Even with the freeze in place, you can still do things like apply for a job, rent an apartment, or buy insurance without having to remove or lift it.
Adding a security freeze can provide extra security against fraudulent attempts to open new accounts or obtain loans in your name.