Used in conjunction with the *if command, *else is used when prior *if or *elseif checks fail.
*create gender "male"
*create garment "pants"
*if gender = "male"
*set garment "pants"
*goto clothing
*if gender = "female"
*set garment "dress"
*goto clothing
*else
*set garment "barrel"
*goto clothing
*label clothing
Since you're a ${gender}, you pick the ${garment} to wear.
*finish
Looking for a little more detail? Try the wiki page