Emotes are a way to show off dance moves or as a form of taunt to killers (note that killers do not change in behavior if you were to use emotes). Emotes can be located in shop > emotes. All of the emotes require a certain amount of survivals and can be activated by pressing E on a keyboard (or a button above the jump button for mobile/tablet users).
There are many emotes to choose from. We don't have all of the emote pages complete yet. Emotes with no images are replaced with the placeholder image above. Keep that in mind. Thanks.