The literal meaning of Black Magic is to make something appear in a form other than its real one. Magic occurs when a Magician, Sorcerer, Soothsayer etc makes falsehood appear to be true or makes something appear differently to people in other than its true form.
The technical meaning of black magic is anything of which the cause is hidden and which appears in a form other than its real one with the intention to distort the reality of things and deceive. There has been a huge difference of opinion among the scholars because of its nature so the definitions vary widely. However, black magic is anything that the cause of which is hidden and which appears in a form other than its real one with the intention to distort the reality of things and deceive
EVIDENCE FROM THE QUR'AN AND SUNNAH TO PROVE THAT BLACK MAGIC EXISTS
Allah (SWT) says:
"And they followed [instead] what the devils had recited during the reign of Sulaiman (AS) but it was not Sulaiman who disbelieved, but it was the devils who disbelieved; Teaching people magic and that which was revealed to the two angels at Babylon, Harut and Marut. But the two angels do not teach anyone unless they say, "We are a trial, so do not disbelieve [by practicing magic]." And [yet] they learn from them that by which they cause separation between a man and his wife. But they do not harm anyone through it except by permission of Allah. And the people learn what harms them and does not benefit them. But the Children of Israel certainly knew that whoever purchased the magic would not have in the Hereafter any share. And wretched is that for which they sold themselves, if they only knew." (Al-Baqarah: 102)
"And they said: 'No matter what sign you bring us with which to bewitch us, we will not be believers in you." (Al-A'raf: 132)
"And when they had thrown, Moses said: 'What you have brought is [only] magic. Indeed, Allah will expose its worthlessness. Indeed, Allah does not amend the work of corrupters." (Yunus: 81)
Narrated from Abdullah ibn Umar (RAA); Two men came from the East and addressed the people who wondered at their eloquent speech. On that Allah's Messenger صلى الله عليه وسلم said: "Some eloquent speech is as effective as Magic." (Bukhari)