TGC stands for The Gospel Coalition, a United Nations organization founded in 2005 in the United States to spread Reformed theology and gospel-centered faith around the world.

Over 300,000 lectures, sermons, talks, essays and reviews are posted on the TGC website at www.thegospelcoalition.org. On the US site, new items are uploaded every day, with 20 million unique visitors and 150 million views each year. TGC is actively engaged in not only online ministry but also offline ministry such as education, publishing, and outreach. In addition, we constantly check the direction of reformism by holding national conferences and women's conferences every other year, and lead the reformist movement by conducting various seminars around the world.

Currently, there are 1,500 churches and 30-400,000 members in the United States that have joined the TGC. Many churches in Africa, China, and Latin America have adopted and used the TGC Confession of Faith.

After a year of preparation from December 2017, TGC Korea (TGCK) was officially launched in November 2018. A board of directors was formed of pastors seeking Reformed faith, and a staff and other staff were appointed. TGC Korea was established to inherit the philosophy and confession of TGC and to defend and spread reformist faith in Korean and Korean-speaking Korean communities.

TGC Korea website provides videos and articles on various subjects in Korean for free. The TGC Korean site is linked to the TGC headquarters website, along with US English, Canadian English, Australian English, Spanish, French, Italian, Chinese, and Arabic sites. Also, TGC (DA Carson, Tim Keller), Desiring God (John Piper), Ligonier (RC Sproul), Nine Marks (Mark Dever), and Unlimited Grace (Brian Chapel) are five popular sites that represent the Reformed faith in America. The high quality materials of) are officially authorized and introduced to Korea in Korean.