This is called the Message Of The Day (MOTD) and with it you can give a personal touch to your server and give players info about your server, like if FF is on or off, or some rules.

• 用它可以传递服务器的个性感受和传达关于你服务器的一些信息，比如队友伤害是开着的还是关闭的，或者其他一些规则。