Could someone please direct me to a website that explains why acid-base titration is a useful technique in chemistry.

Or offer your own opinions.

Thanks ahead of time for any input!

Here is one web site. It's actually a little sparse but it may get you started.

http://en.wikipedia.org/wiki/Titration#Particular_uses
You will need to scroll down to the box that enumerates what you want to know about titrations.