What are they?
They are little icons to express a moment of emotion in chat.
Where can you use them?
Browsers (Firefox, Opera, etc) [links below].
TChat for Twitch (Android) [Website]
Why to get them?
Obviously you can still enjoy a stream without them. Though sometimes it can give a little more excitement to use a picture, and you may feel a form of community connection being able to show the same image as someone else. A wall of POGGERS, as an example. Or being able to say FeelsBirthdayMan, alongside a happy birthday message can feel nice.
Better Twitch TV (BTTV)
How to download:
Better Twitch TV Browser Addon
BTTV Emotes in Sirenwatcher’s Channel:
5/5
monkaS
Clap
OMEGALUL
POGGERS
pepeJAMMER
How to enable them in your own stream:
- Go to website > https://manage.betterttv.net/
- Connect Twitch.
- Click My Emotes at top.
- Click + Add, in Shared Emotes.
- Pick one you like.
- Or type in a search idea at the bottom (example, Clap).
- Bottom right, click Use in my Channel.
- Click My Emotes at top, repeat proccess.
- You can also upload your own channel custom emotes, which is great if you are a smaller channel. These are public, so once you have uploaded anyone can use (though I believe you can take them down later if you request).
FrankerFaceZ (FFZ)
How to download:
FFZ Emotes in Sirenwatcher’s Channel:
22/25
FeelsBadMan
RIP
ThinkinG
ShrugBlob
monkaLurk
monkaCozy
FeelsSadMan
PepeHands
PepeGenius
MonkaGun
MonkaHmm
PressF
FacePalm
FeelsBirthdayMan
PillowYes
PillowNo
KermitTea
x 
vineLore
StrimPlz
DataFace
peepoLove
monkaH
How to enable them in your own stream:
- Go to website https://www.frankerfacez.com/
- Link to Twitch.
- Click Emotes at top, Public Library.
- On right hand side you can change how they appear (my favourite is Usage Count, Descending)
- Click one you like.
- Click Add to My Channel.
- Top bar click My Channel.
- Yu can now see all your emotes on your channel. You can share that html also.