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I saw here that:
As you probably already know, relying
on client-side validation alone is a
very bad idea. Always perform
appropriate server-side validation as
well.
Could you explain why server-side validation is a must?
Client-side validation – I assume you are talking about web pages here – relies on JavaScript.
JavaScript powered validation can be turned off in the user’s browser, fail due to a scripting error, or be maliciously circumvented without much effort.
Also, the whole process of form submission can be faked.
Therefore, there is never a guarantee that what arrives server side, is clean and safe data.