As the category suggests, this place gives you the opportunity to thank a person or a number of people for any direct help they have afforded you or a topic/post they created which indirectly assisted in your growth.
If you have managed to work your way through certain emotions, you will automatically feel a huge amount of gratitude to the person or group of people for the role that they played in helping you achieve it.
It is also a wonderful feeling to receive thanks from others as it provides you with real joy in knowing that your contribution was beneficial in somebody else's growth.