Customer insight is when businesses try to understand what their customers want and need. When a business wants to sell something to someone, they need to know what the person likes and what they don't like. That way, the business can make sure that what they are selling will make the person happy and they will want to buy it.
To get customer insight, businesses can do things like ask people questions about what they like and don't like, look at what products sell the most, and watch how people use their products.
So, let's say you really like ice cream. A business that wants to sell ice cream would want to know what flavors you like and what type of ice cream you prefer. That information helps them make sure they have the right flavors and types of ice cream in stock for customers like you.
Overall, customer insight helps businesses make sure they are giving their customers what they really want and need.