The resurrection is the single most important event in Christian theology, showing Jesus's victory over death and the grave. Through Christ and his victory over death, all can have victory through Him.
Resurrection is the act of coming back from the dead. Jesus's body laid in his tomb for 3 days before Jesus rose again. His body was not like it had been before, now able to walk through walls and appear suddenly among His disciples. He could also keep Himself from being recognized unless He wished. Jesus stayed on the earth after his resurrection until His ascension.