Facebook Messenger Lite is a basic-features-only version of Facebook Messenger, designed to work on pretty much any Android version and on slow cellular networks. It allows sending and receiving messages, images, voice notes, stickers, and audio calls, but not sending videos and making video calls.
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Pro Gets features while staying small
It has received several features the full app has (stickers, voice and video calls) while the app size stays about the same.
Pro Can run on slow phones
Being light (installed it takes up 6-10 MB of memory) and fast, Messenger Lite can run on phones with Android 2.3 and up.
Pro Works on all networks
This app was made with 2G networks and areas with slow or unstable internet connections in mind. If you lose the connection, your messages will be delivered when you have signal again.
Con No secret chats
Doesn't support end-to-end encrypted "secret chats" like the full app.
Con Doesn't support deactivated accounts
The full app has a feature where the user can deactivate their Facebook profile, but continue using Messenger. Lite lacks that feature.