What is the difference please between two themes?

Hello Campers,
please I have found on the markets wordpress themes with html, css, javascript only
and wordpress themes with html, css, javascript, php, mySQL
the first seems not to use backend languages
What is the difference? and why a client buys one of them and does not buy the other?
and many thanks in advance

I think you’ve already answered your own question.

As for why a customer would want to purchase one product over another, that all depends on what the two products offer and what the customer needs.

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thanks for reply. does that mean still someone may want a website without backend?
sorry I have known about frontend languages only till now
so why a client does not need backend? what kind of sites does not include backend and for which purposes sites without backend are used for example?
and thanks so much