What is a chunk?
A lot of students usually ask this question when they see this word for the first time. However, they unconsciously use them when they speak or write in English.
We can say that a chunk of language is a common phrase or clause, that is to say a piece of speech, that we use with a specific purpose, such as to show understanding between speaker and listener.
Some examples are: 'you know', 'or something'.
The following video provided by Cambridge English explains perfectly what a chunk is:
Do you use chunks in your daily speech? Could you add more examples?