The Garden of Eden is where our first parents lived. Because Adam and Eve transgressed this command and partook of the fruit of the tree of the knowledge of good and evil, they were cast out from the presence of the Lord. In other words, they experienced spiritual death. They also became mortal—subject to physical death. This spiritual and physical death is called the Fall.
The Fall is an integral part of Heavenly Father's plan of salvation and it has a twofold direction—downward yet forward. In addition to introducing physical and spiritual death, it gave us the opportunity to be born on the earth and to learn and progress. Through our righteous exercise of agency and our sincere repentance when we sin, we can come unto Christ and, through His Atonement, prepare to receive the gift of eternal life. The prophet Lehi taught:
"If Adam had not transgressed he would not have fallen, but he would have remained in the garden of Eden. And all things which were created must have remained in the same state in which they were after they were created; and they must have remained forever, and had no end."