When we talk about building systems, two of the most important goals are making sure they can grow and that they're dependable. Imagine you're planning a small party that suddenly becomes popular, and now you need to accommodate a lot more guests. Your party (system) needs to scale up. At the same time, you want to ensure that everything goes smoothly without any hitches—that's where reliability comes in.

Scalability: This is about the system's ability to handle growth