It's a sharing platform for piano tablatures. Based on user generated content and peer review, its purpose is to offer the largest and the most significant piano tablatures library.
It's also the final study project of Stanley Lambot.
Tablatures, most of the time abbreviated as tabs, are form of music notation. Easy to read, they are a great way of learning the basics of playing an instrument.
Also, tabs can be usefull to learn to play a song when you can't read a music sheet.