default shell in Ubuntu

[vsrk sarma]

First of all, pardon me for raising fundamental query.
I like now about default shell available in terminal mode.
It seems it is dash and NOT bash, as /usr/bin/sh links to /usr/bin/dash.
Is my premise correct?
If so in what way dash differs from bash?
Is any web link available to documentation on features and use of dash?

-- 
vsrk sarma
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