Macbeth is an opera by Giuseppe Verdi. It is based on Shakespeare’s play with the same name. The opera is normally in Italian, though there is also a French version that's almost never used anymore. The libretto (the words) was written by Francesco Maria Piave with some extra additions by Andrea Maffei.
Verdi wrote several works based on Shakespeare plays. Macbeth was the first of these. It was composed in 1847, at a time when he was composing a lot of operas. In those days Italian operas were always about a love story, but Macbeth was unusual because there was no love story. Instead, it is a story about wanting power, even if means murder. The opera helped to make him very famous, and it has remained one of his most popular operas.