Honorific term used in formal business writing and speech to refer to the recipient's company. Often paired with 御社 (おんしゃ) which is slightly less formal and more common in spoken business Japanese.
See also: 御社
I wish your company continued success.
We are very interested in your company's products.
your shrine
Rare honorific use when addressing a shrine in formal writing. In modern Japanese, 御社 (おんしゃ) is not used for shrines, so 貴社 can serve this specific function, though it is uncommon.
It is an honor to participate in your shrine's historic festival.
We are delighted to hear of your company's continued prosperity.
In closing, we wish your company continued success.
I plan to visit your company next week.