Ravelry is a great website for knitters and crocheters. It's also one of the first websites I learned about for knitters and crocheters. I am still new to the Ravelry website and have yet to fully explore all it has to offer.
The following information is from the Ravelry 'About Us' page:
Ravelry is a place for knitters, crocheters, designers, spinners, weavers and dyers to keep track of their yarn, tools, project and pattern information, and look to others for ideas and inspiration. The content here is all user- driven; we as a community make the site what it is. Ravelry is a great place for you to keep notes about your projects, see what other people are making, find the perfect pattern and connect with people who love to play with yarn from all over the world in our forums.
For more information about Ravelry, click on the link below to watch a brief video introduction to the Ravelry website: