How are indentured servants similar to slaves? How are they also very different?

Indentured servants, like slaves, can be purchased. Their work and their living quarters are also dictated by their employers. However, indentured servants have a limit on their terms. They, like Polly, may speak to the owners of the plantation. They have the option of one day being free (regardless of how long their term might be). In addition, Polly has yet to be hit, unlike both Noah and Amari.