Proximity means to place the similar or related elements together. Proximity is simply the process of ensuring related design elements are placed together. Any unrelated items should be spaced apart. Proximity indicates that items are connected or have a relationship with each other and become one visual unit which helps to organize or give structure to a layout. The proximity enhances the beauty of your design and makes it more attractive.
Proximity in design simply means that objects near each other are seen as a unit.
You can apply proximity in your designs in a simple way. It really is that simple and it’s something you see every day. On your web page or your business card, related information is placed closely together and it forms a visual unit.