Who was the person that came to America and worked without pay to pay off the cost of their voyage?

Many people wanted to come to America from Europe, but a lot of people could not afford to pay for passage on a boat. These poorer folks who wanted to make a better life for their families had the option to come over on a boat, and then work off their debt as a slave for a period of around 7 years. This practice was known as indentured servitude.