Whitman's "O Captain! My Captain" is an elegy about -

• O Captain! My Captain:
- এটি একটি elegy.
- এই elegy টি President Abraham Lincoln কে নিয়ে লিখা।
- It celebrates the end of the American Civil War.

• Walt Whitman:
- তিনি একজন American poet.
- তিনি একাধারে একজন poet, journalist এবং essayist.

• Notable works: 
- Calamus
- Crossing Brooklyn Ferry
- Democratic Vistas
- Drum-Taps
- I Sing the Body Electric
- O Captain! My Captain!
- Sequel to Drum-Taps
- Song of Myself

Source: Britannica.