ecDB is basically a place where you, as an electronics hobbyist (or professional) can add your own components to your personal database to keep track of what components you own, where they are, how many you own and so on.
Me, Nils, have always wanted to have a system like this to keep track of what component I own. Before I created this system I (I guess you too…) had to dig through boxes filled with components to maybe find that component I needed. This is an unnecessary task to do, it not only takes time, and it also can be really frustrating not to find that component you are looking for. So I ended up creating this website where I easily can keep track of my components!