Discord is a free online service for text messaging, voice chat, video chat, and group chat. It will enable you as well share photos and files easily.
Also, developers use Discord to communicate and build communities around their apps.
You can also create and join groups with other users to collaborate on projects.
Discord can be used for gaming sessions, where gamers communicate with each other while playing. Or it can be used as social activities like hanging out with friends or attending meetups.