Dissolve the dried malt extract and slowly bring it to a boil. Cover lid with tin foil and cool. Add Wyeast and attach stopper and airlock. Shake the flask and wait 12-24 hours. Brew and add the yeast starter to the cooled wort.
Detailed instructions come with each yeast starter kit.
Results in healthier yeast, better attenuation, and faster fermentation. Helps yeast get off to faster start, finishing in a cleaner tasting beer.