r ( 1 ) You tube : You Tube is a video sharing service where users can watch , like , share common and upload their own videos . The video service can be assessed on PCs , laptops tablet and via mobile phones . ( 2 ) WIKIPEDIA : Wikipedia is a free online encyclopaedia , created and edited by volunteers around the world and hosted by the Wikipedia foundation . ( 3 ) Android : Android is a mobile operating system developed bye Google . It is based on a modified VERSION of the Linux kernel and other open source software , and is designed primarily for TOUCHSCREEN mobile devices such as smartphones and tablets . (4 ) IOS : IOS is a mobile operating system created and developed by apple INC , exclusively for is hardware . It is the operating system that presently powers many of the companies mobile device , including the iPhone , IPAD , and iPod touch . It is the second most popular mobile operating system globally after Android . ( 5 ) Colour OS : ColourOs is an operating system created by OPPO electronics . It is a FORK of Google's operating system Android . Hope it's helped you.... Plz marks as Brainleist answer