Blockchain Structure is similar to brick blocks that we use to construct of our home and the transactions are all varied in such a manner where we can see every address. Where does the real money came and where it went or how much it had balance.
There is no specific feature for the blockchain it self. Just imagine it as a block that is interconnected to each other derived from the name it self chained to each other. Each block contains specific data or the blocks qhere records are kept that sharing nodes can acces.
For a programmer's view, it is a connection of a group of mixed characters basically hashed data, that is relative to the first hashed data. For ordinary people to understand, it is literally a blocks that are interconnected.
Imagining the picture of blockchain will probably help us to understand how this technology work and function.
You can already imagine it based on its name "blockchain". Literally you can think of it as a chain of blocks. A block consisting of an information and linked with another block with similar information. A block linked with another block and linked with another block and again and again. And that's what blockchain. Just use your imagination or you can just search for a visual representation on Google.
For my perspective, blockchain looks like a constructing a building that requires a lot of blocks to acquire it. Thus, every blocks is consist of information (the sand and water) to become a block that can be connected on other blocks.
It is not tangible, and therefore there is no physical manifestation of it. Though data, often can be reoresented by graphs made and conceptualized by people. And hence the word 'blockchain', it essentially are only blocks of data that point to one another, which makes it looks like a chain of blocks.
These blocks just contain digital data, anything from currencies to even pure storage purposes of other file types.