What's the differences with EOS and digital cameras?

what's the differences with EOS and digital cameras? do professional photographers prefer eos over digital? also do cameras have a shell life like other electronics, Where it's good at the moment than a better one comes in 1-2 years? i was thinking of investing in a fairly good camera but curious on... show more what's the differences with EOS and digital cameras?

do professional photographers prefer eos over digital?

also do cameras have a shell life like other electronics,
Where it's good at the moment than a better one comes in 1-2 years?

i was thinking of investing in a fairly good camera but curious on these questions.. thanks
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