What is BalenaOS?

Can you explain what BalenaOS is and what sets it apart from other operating systems? Is it specifically designed for a certain type of hardware or application? Are there any unique features or advantages that BalenaOS offers to its users? I'm particularly interested in learning about how it's used in the context of IoT devices and if there are any specific industries or use cases where BalenaOS is particularly well-suited. Additionally, how does BalenaOS handle security and updates for devices running on it?