Dry skin, which is also known as xerosis, is a condition where the skin becomes dehydrated and lacks moisture.
Dry skin would feel itchy and may appear less radiant.
Dry skin would have a tight feeling, and look dull, flaky, and rough.
There are multiple causes of dry skin including environmental factors and skin conditions like eczema. Some other causes include genetics, nutritional factors, certain medications, etc.
There are 3 specific ingredient categories used for dry skin: emollients, humectants, and occlusives. Each does a job to provide hydration to the skin so learning more about each one is helpful!
Look for products that are lightweight and have hydrating ingredients. You can also look for hydrating serums that can support barrier function and help retain moisture on skin.
Avoid harsh chemicals and fragrances as they can irritate dry skin. Choose non-comedogenic  formulas which means products that are un-likely to block or clog pores.
Oatmeal extract - Soothes inflammation and irritation, while deeply hydrating the skin. Commonly used on eczema prone skin to sooth and prevent further irritation.