Onion powder is a dehydrated, finely ground form of onion, derived from dried onions that have been processed into a powder. Here's a concise description:

1. Appearance: Onion powder is a fine, pale yellow to beige powder, with a texture similar to other ground spices.

2. Texture: The texture of onion powder is smooth and powdery, allowing it to blend easily into dishes.

3. Taste: Onion powder has a concentrated onion flavor, albeit milder than fresh onions. It adds a savory, slightly sweet note to dishes without the texture of fresh onions.

4. Uses: Onion powder is a versatile ingredient used in various culinary applications. It is commonly used as a seasoning or flavor enhancer in dishes such as soups, stews, sauces, marinades, salad dressings, and spice blends. It is also used as a convenient alternative to fresh onions in recipes where a smoother texture is desired.

5. Storage: Onion powder should be stored in an airtight container in a cool, dry place away from moisture and sunlight to maintain its flavor and potency.

Overall, onion powder is valued for its convenience, long shelf life, and ability to add depth of flavor to a wide range of dishes, making it a staple ingredient in many kitchens.