meaning of a sentence

[ehsanshekari]

I need an explanation about the sentence below.(Even I can't understand in which meaning the words have been used.)

Form ever follows function.

Good luck.

 

[Anglika]

It means that the application/use/purpose [function] of something will always govern its shape or design [form].

So a spade's shape is developed from the need to have a hard section to dig into the earth joined to a handle long enough for the user to stand when digging. Its form [shape] follows its function [to dig in the earth]