An order block as it implies means a block of orders stacked up by financial institutions, banks, professional investors and traders, hedge funds, the interbank market etc.
These guys are referred to as Smart Money - Basically the Big Players.
Why do order blocks exist and how do they work?
The simple answer is liquidity, I’ll explain below.
When these guys want to buy a position of say $300m worth of $BTC, they do so in stages by placing their orders at the accumulation stage before price moves to their entry point.
NFT stands for "Non-fungible Token" which are simply tokens that cannot be swapped for another.
For instance a 500 naira note in your wallet is the same note in mine and it can be divided eg #200+#200+#100 = #500
That's simply what fungibility means.
But an NFT is unique and can't be duplicated anywhere else in the world, that is if I own an NFT, no one else can have it and that's what non-fungibility is.
And unique items have more value compared to non-unique ones, and here's where the concept of demand and supply comes in.