FACTBOX-Some key facts about slavery

(Reuters) - Britain marks 200 years on March 25 since its first law abolishing trade in African slaves received royal assent, in a major step towards ending a trade that shipped more than 10 million Africans overseas into slavery.

Here are some key facts about the slave trade:

* WHAT IS IT?

-- The condition in which one human being was owned by another. A slave was considered by law as property, or chattel, and deprived of most of the rights ordinarily held by free persons.

* TYPES OF SLAVERY:

-- Two basic types have been identified throughout recorded history: most common was household, patriarchal, or domestic slavery.

-- The other -- productive slavery -- was less common and used slave labour for economic production, such as on plantations. It occurred primarily in classical Greece and Rome, in 9th century Iraq, among the Kwakiutl Indians of the American Northwest and in a few areas of sub-Saharan Africa, and was widespread in the Americas as a result of the Atlantic slave trade.