The following description is from the Base Set of the Lord of the Rings LCG:
From Fantasy Flight Games:
The Lord of the Rings: The Card Game is a cooperative card game that puts 1-2 players (or up to four with two Core Sets!) in control of the most powerful characters and artifacts of Middle-earth. Players will select heroes, gather allies, acquire artifacts, and coordinate their efforts to face Middle-earth’s most dangerous fiends. By cooperating to overcome the obstacles drawn from the encounter deck, you will complete the quest before you and claim victory!
In The Lord of the Rings: The Card Game, players take on the roles of heroes attempting to complete dangerous quests. These quests take place during a broad span, beginning near the end of The Hobbit, and culminating near the beginning of The Fellowship of the Ring. Instead of directly retelling the classic stories that have previously been narrated, this game provides players with a variety of elements—characters, settings, enemies, events, items, artifacts, scenarios—that allow them to embark upon new adventures and share new experiences with these beloved characters during this ominous period of Middle-earth history.