The kerning is the space inbetween 2 letters, program likes Indesign default to a metric kerning which isnt the best all the time, if you are going to try to make a logo by just adjusting the kerning, its best to adjust each individual space by itself to get the best result, i have seen it done where people just select the entire word and adjust as one unit, this gives you awkward spacing that can throw off what you are trying to do, especially if you have alot of "ascenders" and "Descenders". If possible change your kerning to "OPTICAL" then go in there and adjust...... if you want to do it right.
If you want to pay attention and a make a so called logo by tightening the kern, atleast pay attention to each individual space, you will get a better result.
hope this helps