modularity understand

[AbdouLinux]

hello guys,
can anyone help me to understand what's exactly modularity ?, specialy when i click in modularity button in statistic i can't understand the report diagram [size(number of nodes) / Modularity class]
thank you for your help

[admin]

It measures how well a network decomposes into modular communities. This structure, often called a community structure, describes how the the network is compartmentalized into sub-networks. These sub-networks (or communities) have been shown to have significant real-world meaning.

See https://sites.google.com/site/findcommunities/ to learn more.