Hot sauce, chili sauce or pepper sauce refers to any spicy

Piquance

Piquance is a sensation associated with the sense of taste. In various Asian countries it has traditionally been considered a basic taste.-Etymology:...

 sauce

Sauce

In cooking, a sauce is liquid, creaming or semi-solid food served on or used in preparing other foods. Sauces are not normally consumed by themselves; they add flavor, moisture, and visual appeal to another dish. Sauce is a French word taken from the Latin salsus, meaning salted...

 made from chili pepper

Chili pepper

Chili pepper is the fruit of plants from the genus Capsicum, members of the nightshade family, Solanaceae. The term in British English and in Australia, New Zealand, India, Malaysia and other Asian countries is just chilli without pepper.Chili peppers originated in the Americas...

s and other ingredients.
There are many recipes for hot sauces - the common ingredient being any kind of peppers. A group of chemicals called capsaicinoids are responsible for the heat in chili peppers. The peppers are infused in anything from vinegar, oil, water, beer and alcohol to fruits and vegetable pulp.