A la carte is a French expression meaning “from the menu”, eg. from the list of items listed in the menu. It means each item is priced separately and can be chosen out of the list and combined with others. Typically in a restaurant.
The opposite of “a-la-carte” is “one-size-fits-all”.
And in the middle you find “combos” where items are grouped to make meaningful combinations.
One-size-fits-all makes the selection process easier and the delivery process faster. On the other hand, a-la-carte makes the pricing can seem more fair (pay for the functionality you use) and aligned in some ways with costs.