Google refresh or montly update? I am confused

My site as been refresh each 2 days by Google. Refresh/ monthly update?

[rick41]

Please tell me the difference between the refresh Google does apparently for me each 2 days with a date written on the search result, and the big montly update?

[lazerzubb]

This will explain everything:
[webmasterworld.com...]

[rick41]

THank you really much i understand now.