Forgetting the password to your Samsung Tab 4 can be quite frustrating, but fear not, there are ways to regain access to your device. Here are some steps you can take to unlock your Samsung Tab 4 if you forgot the password:

1. Using Samsung Find My Mobile: If you have a Samsung account and have registered your device with Samsung's Find My Mobile service, you can use it to remotely unlock your tablet.
2. Performing a Factory Reset: You can perform a factory reset on your Samsung Tab 4 to erase all data including the forgotten password. This should be used as a last resort as it will wipe all your data.
3. Seeking Professional Help: If you are unable to unlock your device using the above methods, it's recommended to seek help from a professional service center.

Remember to always keep your device secure by regularly updating your passwords and backing up your data to prevent such situations in the future.