Explain who were the Muslim Moors who invaded Spain ?

The Moors were the Muslim inhabitants of the Maghreb, the Iberian Peninsula, Sicily, and Malta during the Middle Ages. The Moors initially were the indigenous Maghrebine Berbers.[1] The name was later also applied to Arabs.[2]

Moors are not a distinct or self-defined people,[3] and the 1911 Encyclopædia Britannica observed that "The term 'Moors' has no real ethnological value."[4] Europeans of the Middle Ages and the early modern period variously applied the name to Arabs, North African Berbers, and Muslim European

is this question from a book? ?

basically means the stoc market is going down since   dow is one of the most sucessful buiness it would be a tragedy for it to go down and it ensures the ruinty of the stock market