Open source means that bugs are shallow. This means that updates and security fixes for your software are released quickly. Keeping you and your data safe from harm. Your software will always be up-to-date and ready to meet the challenges of the day.
Having the source code available means the software can be whatever you want it to be. Need a feature that is not there - simply get it developed. Having a problem with a bug - file a report and see it fixed. Need a software to look a certain way - no problem. Open source is your software and can do anything you want it to do.
Software that evolves. Open source means that you have a wonderful community working to make your software better, faster, and more secure. The community will build in the latest features and give you help when you ask for it. Open source is software the way it should be, natural and collaborative.