Nowadays, the word aioli is pretty much synonymous with mayo, and is often just a simple mayonnaise (store-bought or homemade) that is flavored generously with garlic—a nod to its origins.
garlic
What is Aioli Sauce Made of? The number one ingredient in classic aioli is garlic, plus the standard mayo ingredients for mayo: egg yolk, lemon juice, mustard, and olive oil. Additional flavorings are up to you.
In Occitan cuisine, aioli is typically served with seafood, fish soup, and croutons.
In fact, the name aioli translates to "garlic oil." Aioli gets its creamy consistency and pale color from emulsifying the two ingredients, with a bit of coarse salt. Because garlic does not have strong emulsifying properties like egg yolk, it takes a great deal of elbow grease to emulsify olive oil into the garlic.