This is the 2nd most frequent German word.
und
"Und" means "and" in English.
'Und' is used here as a conjunction to connect two activities that occur simultaneously.
Ich lese ein Buch und trinke einen Tee.
I am reading a book and drinking tea.
'Und' joins two independent clauses to describe actions of different subjects.
Die Katze saß auf dem Sofa, und der Hund lag daneben.
The cat was sitting on the sofa, and the dog was lying next to it.
'Und' is used in this list to connect items, representing that all were purchased.