Meaning of "that" in Essential English Dictionary

that

conjunction uk strong /ðæt/ uk weak /ðət/

A2 used after some verbs, nouns, and adjectives to start a new part of a sentence:

He said that he’d collect it later.

B1 used instead of ‘who’ or ‘which’ in the middle of a sentence:

Have you eaten all the cake that I made yesterday?

(Definition of “that conjunction” from the Cambridge Essential Dictionary © Cambridge University Press)