Why is Shakespeare considered one of the greatest writers of all time?

Shakespeare's works have been a major influence on subsequent theatre. Not only did Shakespeare create some of the most admired plays in Western literature, he also transformed English theatre by expanding expectations about what could be accomplished through characterisation, plot, action, language, and genre. His poetic artistry helped raise the status of popular theatre, permitting it to be admired by intellectuals as well as by those seeking pure entertainment That's a good answer. I've also heard it said that Shakespheare's contribution to cultural history during the modern period is the invention of the personality or the psyche. Can someone expalin this?