What did Neil Armstrong mean when he said Houston tranquility is here the eagkle has landed when he arrived at the moon?

Answer 1

He meant that they had landed on the moon on the area they were told to land.a

Answer 2

Neil Armstrong meant that the spacecraft had successfully landed on the moon, bringing a sense of peace and accomplishment to the mission control center in Houston. The reference to "tranquility" and "eagle" was a nod to the name of the lunar module, Eagle, that safely carried them to the lunar surface.