Mark up Validation service

[mrs incredible]

Hi

I have run a test of my site through this Mark up Validation Service:
http://validator.w3.org
and it came back with 108 errors and that my site failed validation

Its mostly, well actually all gibberish to me.
Question is how valuable/accurate are its findings?

Thank you

[pinbrook]

do a quick search in the forum on "validation" to see what others say about actinic code and w3c validation