Woolly Bugger is a streamer and fished under the water surface.
They are bound in a variety of styles, weights and colors to mimic a wide variety of small fish.
It is a popular and widely used pattern for both freshwater and saltwater game fish and is widely cited as one of the best patterns to have in any fly box. John Gierach, a noted fly-fishing authors discussed the Woolly Bugger first in his chapter on streamers in Good Flies. Woolly Buggers are usually fished in streams, rivers, ponds, lakes and tidal flats.