What is open source? Open source is the ability to edit or modify anything thats publicly accessible. Basically what this means is anyone can go to a website and edit it one example is Wikipedia. The pros of this include free licensing, meaning there is no fee and anyone could improve the data at anytime. The cons of this are that someone could write false information, and people dont get credit for information that they post. Ultimately, open source could either benefit or be a disadvantage for any software.