CK-12 Flexbooks offer customizable, free, curriculum-aligned content for K-12! CK-12 Foundation, launched in 2006, is a not for profit organization with the goal of decreasing textbook materials costs for the K-12 education market in the United States and around the world. CK-12 hopes to be a pioneer in generating and distributing high quality educational content through the use of a web-based open content material, termed the "FlexBook.” The Flexbook is a digital textbook that allows individuals to adapt the content as they see fit. This allows educators to customize their texts to their students’ learning styles, locations, languages, or ability levels. Updating text is also just a click away. Not only is it adaptable, but it is also affordable. CK-12 allows individuals to create, edit, and print textbooks for free. No longer do districts have to rely on book companies whose products are often expensive and out of date. CK-12 flexbooks conform to national and state curriculum guidelines and standards, are available to everyone, and is currently the only free service like this of its kind.