Salted butter

Cream churned until the fat separates from the buttermilk.

What to do with it

Classics built on it

Kinds

Unsalted
The baseline: you add salt yourself.
Salted
Around 1.5–2% salt.
Cultured
Made from soured cream — tangier, more aromatic.
Clarified / ghee
Milk solids removed, so it takes high heat.

Knowing it

Where to buy
Anywhere. Cultured butter from dairies, delis and good cheese shops.
A little history
Among the oldest dairy foods there is. Before refrigeration, most butter was cultured by default.

Kitchens that keep it in