Live streaming is sharing video to a live audience through the internet. This is different from uploading the video to the web and the viewers downloading a full video's data before watching it (e.g. YouTube, Vimeo).
To produce a stream yourself, you will need a video & audio source (e.g. Mevo), a fast internet connection, and a destination for your content such as Livestream or Facebook Live. We have some best practices for streaming here.