Adam and Eve were the first two human beings, created on day 6 of creation. Sometime after creation they were tempted by Satan into disobeying God, and their corruption into sin and death has been passed on to all creation ever since. Following their first sin, God promised a Savior to atone for the sin they brought into the world and to defeat Satan (Genesis 3:15).
The exact date of creation and the time of Adam and Eve is unknown. Estimates include anywhere from 6,000 BC to 4000 BC, though these estimates are highly speculative.