What do I actually own if I buy an NFT?

If I decide to purchase an NFT, what exactly am I acquiring? Is it a tangible item, or is it something more conceptual? Does purchasing an NFT grant me ownership of the underlying digital asset, or is it simply a claim to ownership on a blockchain? Will I be able to physically possess or reproduce the NFT in any form? Are there any limitations or restrictions on what I can do with the NFT after purchase? Understanding the intricacies of NFT ownership is crucial before making any investment decision.