Explanation:

- Indirect Tax: The burden of an indirect tax, such as sales tax or VAT, can be shifted from producers to consumers. It is included in the price of goods and services, so consumers ultimately bear the cost when they purchase these items.

- Direct Tax: This type of tax is paid directly by individuals or organizations to the government and cannot be shifted. Examples include income tax and property tax.

- Ad Valorem Tax: This is a tax based on the value of a transaction or property. It's typically a percentage of the value, such as sales tax. It can sometimes be indirect, depending on context.

- Specific Tax: This tax is set as a fixed amount per unit. It does not change with the price of the product, like excise duty on tobacco. It can also be an indirect tax.