LastPass is a password manager that securely stores your passwords and personal information in a secure vault. As you visit apps and sites, LastPass autofills your login credentials. All you have to do is remember your LastPass master password, and LastPass will autofill logins for you.
The free plan is created basically to get you hooked. The creators have put a limitation on changing the devices, so once you have it used there is no way for you to change it without upgrading to paid plan. There is no option to export your data from the app on the free plan, so you are blackmailed to buy their paid plan or you will lose everything.
These are nasty dark patterns. This is unacceptable for a company that markets itself as trustworthy and specialized in cybersecurity. They keep my data hostage. I strongly recommend that everyone avoid this software and use something open-sourced instead.