"CTTO" stands for "Credit To The Owner." It is commonly used as a disclaimer or tagline to give credit to the original source or owner of a piece of content, such as an image, video, or piece of text. The term originated in online communities, particularly in the context of social media platforms where users can share and re-post content created by others. The use of "CTTO" serves as a way to give proper credit and avoid plagiarism. The exact origin of the term is unknown, but it has been in widespread use on the internet for several years.