Solution:
A piecewise function is a function that is defined by multiple sub-functions, each sub-function applying to a certain interval of the main function's domain (a sub-domain).
A real-world example where piecewise function might be used is in taxing systems where tax brackets are used. For example, consider a simple tax system in which incomes up to $50,000 are taxed at 15%, and any additional income is taxed at 25%.
The taxes are charged based on the income of workers which shows multiple sub-functions within the domain of the main function.