In economics, the term ‘goods’ is defined as a commodity that satisfies human wants, i.e. something which provides utility to consumers. Various types of goods are studied in economics, like normal goods, inferior goods, luxury goods, Veblen goods, Giffen goods. Giffen goods are goods whose demand increases with the increase in its price and vice versa.
On the contrary, inferior goods are those goods whose demand decreases with an increase in the consumer’s income. As the income effect of Giffen goods and Inferior goods is negative, the two are commonly juxtaposed for one another. So, this article might help you in understanding the difference between Giffen goods and Inferior goods.normal goods are goods which tends to increase as when income of costomer increase

Normal Goods
Normal goods are products for which demand increases as consumer income rises. These goods have a positive income elasticity of demand, typically between 0 and 1. Examples include clothing, electronics, and vacations. As consumers become wealthier, they are able to afford more of these goods, leading to an increase in demand.

Inferior Goods
Inferior goods are products for which demand decreases as consumer income rises. These goods have a negative income elasticity of demand. Examples include generic brands, public transportation, and used cars. As consumers' incomes increase, they tend to switch to higher-quality alternatives, leading to a decrease in demand for inferior goods.

Giffen Goods
Giffen goods are a unique type of inferior good for which demand actually increases as the price rises and income remains constant. This phenomenon contradicts the law of demand. Giffen goods are often essential items for which there are no close substitutes and make up a large portion of a consumer's budget, such as staple foods during a famine. The higher price of the Giffen good may lead consumers to allocate more of their income towards it, causing an increase in demand.
In summary, normal goods have a positive income elasticity of demand, inferior goods have a negative income elasticity of demand, and Giffen goods are a rare type of inferior good for which demand increases as the price rises. Understanding the differences between these types of goods can help businesses make more informed decisions about pricing and marketing strategies.