- YouTube was created in 2005 by three friends and allowed users to upload and share videos. It grew rapidly, with over 100 million videos watched daily by 2006. - Google acquired YouTube for $1.65 billion in 2006. While it provided a platform for sharing, it also faced issues around copyright infringement as some uploaded content violated others' copyrights. - The Digital Millennium Copyright Act (DMCA) of 1998 was passed to limit the liability of online platforms for copyright violations by their users. It established a notice-and-takedown process for copyright claims on sites like YouTube.