If you're using Windows Vista or XP, Discord will not work on your system.
This allows you to hear the audio from the direction of the player speaking, making gameplay more immersive and giving competitive players an edge. A self-generated certificate is not tied to anything, a Class 1 certificate is tied to an e-mail address and a Class 2 certificate requires proof of identity.
The large section in the middle is the main chat area, where each message has the person's username, avatar (or image), and timestamp.
On the right is a list of all the people in the chat, where it also ways what games each person is playing (if applicable and set up by the user).
You are sharing server bandwidth with every other discord user.
Meaning if you are using discord and need voice coms for say example your guild is raiding something, and every other discord user on the planet decides to log on YOUR guilds raid is going to suffer because you don't have dedicated bandwith discords overall performance will suffer immensely.