system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5  What is a filibuster and what did this Rand guy do with it?
gpt
a filibuster is the process by which a senator blocks the rest of the senate from being able to vote on a particular bill. They do that (or used to) by standing at the podium and speaking. endlessly. The rules have apparently changed lately, allowing people to simply state their intent to filibuster, which accomplishes the same time, absent the requirement to speak constantly. 

Thee isn't a requirement that you have to talk about any particular subject matter. You could literally read the phone book, you just have to stand there and talk.