CAML - Understanding when to use Eq, Geg and Value

With the following CAML query:

camlQuery.set_viewXml('<View><Query><Where><Geq><FieldRef Name=\'ID\'/>' + '<Value Type=\'Number\'>1</Value></Geq></Where></Query><RowLimit>100</RowLimit></View>');

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  What is the difference between using <Geg> and <Eq> in the above query?

  
  


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  Is this query assuming that there is a value in m list of 1 for the current ID? I am trying to understand what Value Type Number 1 means?