"To be or not to be that is the question." - in which play is this quotation found?

• Hamlet is a famous tragedy of William Shakespeare.

• Famous quotations of Hamlet:
- 'To be or not to be that is the question',
- 'Frailty, thy name is woman',
- Brevity is the soul of wit',
- Neither a borrower nor a lender be; For loan oft loses both itself and friend',
- 'There is divinity that shapes our end'.

• The important character of Hamlet:
- Ophelia,
- Hamlet,
- Claudius,
- Gertrude,
- Horatio,
- Polonius etc.

Source: Encyclopedia of Britannica and Hamlet.