Em, eh, um…
Interjection sounds aren’t even really words but they are full of meaning! The English language is full of them. In some cases, if you make the wrong interjection sound, it can give completely the wrong meaning.
Interjection sounds can be used as a space filler or a kind of pause while speaking, like in the three examples in the title above, or as a way to express surprise, (dis)agreement, happiness, sympathy… pretty much every emotion you can think of!
You might recognise some of the sounds in the picture; there are lots more!