You might be thinking to yourself, "Why do we need to talk about security? Isn't open source software at odds with security because of its open nature?" The truth is, open source software tends to be the most secure software out there. For instance, there are studies that show that Microsoft's IIS web server is compromised up to 400% more than the open source Apache web server, despite the fact that Apache is used on around 70% of web sites, and IIS only around 20%.