在春节期间发红包是一种习俗。

It is a custom to give red envelopes during Chinese New Year.

发红包的概念是2014年微信引入的，拥有4亿多注册用户的微信是中国最大的门户网站之一腾讯网旗下的品牌。红包概念一经推出立刻获得成功。

The idea was introduced in 2014 by WeChat, a mobile messaging system with over 400 million users and operated by Tencent, China's largest Internet service portal. It was immediately successful.