Answer:
Separated from her twin brother Sebastian in a shipwreck, Viola disguises herself as a boy, calls herself Cesario, and becomes a servant to the Duke Orsino. He sends her to woo the Countess Olivia on his behalf, but the Countess falls in love with Cesario. Meanwhile Olivia's uncle, Sir Toby Belch, gets drunk with his friend Sir Andrew Aguecheek and they play a trick on Malvolio, Olivia's steward. Eventually Sebastian turns up and causes even more confusion and chaos.
Step-by-step explanation: