What does block/entity mean, using the /stats command, in Minecraft?

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I just wanted to know what /stats is about, in Minecraft 1.8. I have used it, before, but I just can not understand its use.
I know about scoreboards, but I still do not understand what the whole block or entity thing is about.
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What is a block entity in Minecraft?
A block entity (previously named tile entity) is extra data associated with a block, beyond the block ID and 4 extra bits of data that every block has.How do you count entity in Minecraft?
A command block has a block entity associated with it that holds additional data about the block.Is a command block an entity?
Traditionally an entity is a mob which is a living creature that moves around in the game. This is true in most cases. However, there are a handful of entities that are items with data tags you can change in the game such as an armor stand or a painting.What are Blocks, Entities, and Tile Entities? - Minecraft Tutorial
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Liza Summer, Tatiana Syrikova, Mikhail Nilov, Liza Summer