Selections are a fundamental part of the AVA software. They are required to complete certain functions in the software but they are also extremely useful in helping you achieve exciting design effects.
The Similar function is often used in conjunction with the Magic Wand Tool. Click on a colour or tone with the Magic Wand Tool and then go to Edit Menu Select > Similar. The software will search the rest of the design for similar colours and highlight them with a selection. This is very useful when copying and pasting specific motifs or protecting colours in a design. Use the keyboard shortcut ⌘E for this function.