In basic form a dynamic website asks users to login. When logged in the user acts on information based on their choices. Examples are Amazon, Facebook, and Capital One. All these use variants of what is known as "Shopping Carts".
PayPal revolutionized e-commerce by offering a cloud based version of the shopping cart. Along with the ability for anyone to accept credit card payments.
Website design has, over the years evolved to use what is now referred to as "The Cloud". PayPal cloud based e-commerce functions are called into websites via the website owners encrypted PayPal account. The HTML CSS and PHP code is arranged in the website design so visitors can purchase items or pay bills.
A very simple example is Central Storage
Dynamic website user experience is easily done with PHP and MySQL. Open source code with custom modifications allow great varieties of options for web designers in 2021 and beyond!
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