In essence, tax is what people pay to their government. There are many types of taxes. One kind of tax is the income tax. Every year, workers pay a percentage of their income, or salary, to the government of the country in which they live. Another kind of tax is a sales tax. For example, in some Caribbean islands, there is Value Added Tax (VAT) which is an additional payment for certain products and services.
Taxes contribute to public transport, free education in some cases, public lighting and even the security of a country, in its maintenance of an army or navy.