What is a proportional tax and how does it affect people of all incomes

A proportional tax, also referred to as a flat tax, impacts low-income, middle-income, and high-income earners relatively equally.

from my own personal expirence food stamps has alot this makes it eaiser so we can affod bills and so we can life a better lifestyle not needing to worry about paying actual money to buy food since most people spend 100-300 dollars a month on food so this alot so we can afford other bills and other stuff we need