Storage efficiency is how good a storage system is at using the available space. Think about it like cleaning up your toy box. If you put all your toys in neatly, taking up as little space as possible, you have good storage efficiency. But if you just throw your toys in without any organization, you're not using the space as well as you could be.
In the real world, storage efficiency is important for things like computers and phones that store lots of data. If a storage system is not very efficient, it might waste space on the device or take longer to access files.
To make a storage system more efficient, engineers use different techniques like data compression, deduplication (removing duplicate copies of data), and thin provisioning (only allocating the space needed for data). These techniques help fit more data on a device and save valuable storage space.
Overall, having good storage efficiency means you're able to store more stuff in the same amount of space, which can be really handy!