What does Omni-directional & Directional antenna mean?

Omni-directional antennas receive signals equally from all directions. Directional antennas pull in signals better from one direction. In this direction, they can detect a weaker or more distant signal than an equivalent omni-directional antenna. Directional antennas are much more powerful than omni directional counterparts, and able to pull in signals from greater distances, however, users need more patience to find the best reception location and adjust reception angle frequently.