system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the point of filibustering?

I know why people filibuster (IE: in Congress by reading phone books) but it seems like such a dumb way to get your agenda across.
gpt
In general, it's not a way to get your agenda across, it's a way to block a vote or speech from someone you disagree with.

If the schedule says "You have until midnight tonight to vote on this, or it goes in the trash" you can stand up at 7pm and just start talking and refuse to give up the podium until 12:01am in which case it's too late to vote, and the measure is dismissed. 

(Over-simplified, but it's ELI5)