: Stands for Team Win Recovery Project, the leading touch-based custom recovery software for Android.
Download Odin v3.09 or v3.12. Avoid newer versions (like Odin v3.14+), as they are optimized for modern Android devices and sometimes fail to properly interface with legacy devices like the SM-T110.
If TWRP doesn't appear, you likely skipped the "Auto Reboot" step. Re-flash, making sure to remove the checkmark.
In Odin, in the Options tab (this is important to prevent the stock recovery from overwriting TWRP).