Here's a concise summary of the key events of the Apollo 11 mission:

1.  **Launch:** (July 16, 1969) Apollo 11 launched from Kennedy Space Center in Florida atop a Saturn V rocket.
2.  **Translunar Injection (TLI):** The Saturn V's third stage reignited, accelerating the spacecraft out of Earth orbit and onto a trajectory towards the Moon. The Command/Service Module (CSM), Columbia, separated and extracted the Lunar Module (LM), Eagle, from the adapter.
3.  **Lunar Orbit Insertion (LOI):** (July 19) The CSM's main engine fired to slow the spacecraft down, allowing it to be captured by the Moon's gravity and enter lunar orbit.
4.  **LM Descent & Landing:** (July 20)
    *   Neil Armstrong (Commander) and Buzz Aldrin (Lunar Module Pilot) entered Eagle and separated from Columbia (piloted by Michael Collins).
    *   Eagle fired its descent engine to begin landing. Facing computer alarms and overshooting the planned landing site, Armstrong manually piloted Eagle over a boulder field.
    *   With only about 25 seconds of fuel remaining, Eagle landed safely in the Sea of Tranquility. Armstrong radioed: **"Houston, Tranquility Base here. The Eagle has landed."**
5.  **First Moonwalk (EVA):** (July 20)
    *   After several hours of preparation, Armstrong descended the ladder and set foot on the lunar surface (~10:56 pm EDT), uttering the famous phrase: **"That's one small step for [a] man, one giant leap for mankind."**
    *   Aldrin joined him about 20 minutes later.
    *   They unveiled a plaque on the lander leg reading: "Here men from the planet Earth first set foot upon the Moon July 1969, A.D. We came in peace for all mankind." and planted the American flag.
    *   Conducted scientific tasks: Deployed the EASEP (Early Apollo Scientific Experiments Package) experiments (including a seismometer and laser reflector) and collected rock and soil samples (21.7 kg / 47.5 lbs total).
    *   Spoke with President Nixon via radio.
    *   The EVA lasted ~2 hours and 31 minutes.
6.  **Lunar Ascent & Docking:** (July 21) The Eagle's ascent stage lifted off from the Moon, leaving the descent stage behind. It rendezvoused and docked with the orbiting Columbia. Armstrong and Aldrin transferred back to Columbia with their samples, and Eagle was later jettisoned.
7.  **TransEarth Injection (TEI):** (July 22) Columbia's main engine fired to propel the spacecraft out of lunar orbit onto a trajectory back to Earth.
8.  **Splashdown & Recovery:** (July 24) The Command Module Columbia re-entered Earth's atmosphere. Parachutes deployed, and it splashed down safely in the Pacific Ocean near Hawaii. The crew were recovered by the USS Hornet aircraft carrier. Due to quarantine concerns about potential "moon germs," they immediately entered a Mobile Quarantine Facility aboard the ship.

**Key Significance:** Apollo 11 achieved President John F. Kennedy's 1961 goal of landing a man on the Moon and returning him safely to Earth before the end of the decade. It was the first successful crewed lunar landing, marked by Armstrong and Aldrin becoming the first humans to walk on another celestial body. It represented a monumental technological achievement and a pivotal moment in human exploration and history.