Many startup choose .IO for their business especially in Technical niches. .io is considered by entrepreneurs to use the extension as abbreviation and it is a better for domain hacks. People see the extensions like .io, .ly & .st from different view and that help the startups gain popularity. io, as in i/o or, in/out. The new standard in web development is quick communication between the server and the client, sending information in and out between the two.