Comte cheese is from the French Comte region of France and has a much more mild flavor than the Swiss Gruyere. If you are a fondue lover than you may be more familiar with Swiss Gruyere however the original version was from Germany. Originally, Gruyere was neither Swiss Nor French. Comte is aged about 8 months compared to Swiss Gruyere is sometimes only aged for 3 months.
Use Comte in fondues, gratins, or salads. Pairs well with either red or white wines. Look for this cheese in any well-stocked cheese shop. You can typically find this at Whole Foods stores. This cheese can also be found online at Amazon.com : Comte Cheese
If you can't find Comte or would just like an alternative you can substitute: