Instagram is a social network specializing in photos and video sharing. You can follow the activities of other users, view their photos and videos. Photos are taken or edited using the Instagram mobile app. They posted in a square format (600 × 600). Instagram also include several image editing tools and filters.
Instagram is a mobile app only available on smartphone or tablet (Android and iOS), but it is possible to use it on your computer by installing an emulator.
This method applies to both PC and Mac.
NB: You can also access your profile using a web browser by connecting to the official Instagram website, but you won't be able to post or edit photos like with the mobile application.
However, using the below method, you can also post pictures.