system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What is Monsanto?
gpt
Monsanto is a agricultural biotech company which has been around for around over 100 years.  Today, they are mostly known for two things: Genteically modified crops and strong pesticides. You may be familiar with the weed killer "Round-Up", they make that.   
Here's where it gets interesting: They modify the crops in various ways: to make them grow larger, in less than ideal conditions, and to specifically be resistant to Round-up and other pesticides.  Farmers can then douce the crops in round up to kill pests and the crops will not be affected.