What is the meaning of **(-) log10(FDR)** value

How to interpret higher negative value to lower negative value by comparing each other?

e.g. 1:

Ribosome : *(-) log10(FDR) = 25*

Golgi : *(-) log10(FDR) = 5*

e.g. 2:
[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/zCAMa.jpg
It is just to make the value easier to read. 

Instead of 1E-5 you are shown 5 and instead of 1E-25 you are shown 25

The bigger number means a smaller FDR