There’s a number of ways to do this.  You can buy an expensive dedicated macro lens like this one. The difference in this lens is the focal length, or the distance in which the light converges on to you cameras sensor. Or you can do what I do and use you existing zoom lens with a Macro filter set. These have different rings of varying power to  turn you lens into a macro lens very economically. For instance my canon lens can normally only focus on an object as close as 5 feet, however, when you slap one of these on there you’ll be able to focus on an object only a couple of feet away with a large amount of zoom. Note that both of these methods will shorten the depth of field and make focusing more critical. It also creates a nice blur effect on objects in foreground or background. You’ll likely want to switch to manual focus for this.