In the picture you can see huge computer monitor placed on wooden table in working room. You can see young adult male working in front of display. He is typing and looking straight to the screen. Green screen. Probably he is a hacker, programmer or designer. Ar maybe he is just a web user browsing e-shops and social network websites.
You can replace green screen with the footage or picture you want. You can do it with “Keying” effect in Adobe After Effects (check out tutorials on YouTube).