Ellen DeGeneres' Most Memorable TV Show Moments

Ellen DeGeneres is ending her show after 19 seasons ... and to celebrate her last episode ever, we've put together some of the standout celeb moments during her epic run.

Over nearly 2 decades, Ellen undoubtedly made a huge impact on daytime television ... sharing laughs, stunts and tears with her special guests, some of whom she's become close friends with over the years.

Of course, Ellen's greatest scares were a hilarious part of the show, where she'd startle the bejeezus out of guests with a huge surprise right in the middle of interviews.

We can't forget Ellen's most generous giveaway, when she helped an underprivileged school in Detroit ... and the countless other times she's given back to others in need.

As we've reported, Ellen announced she was ending her show, during a taping earlier this month. While she's not retiring from showbiz, she will be taking time off to decide what's next ... and she has some pretty big ventures in the can.

We do know, she recently signed a multi-year deal with Discovery ... on top of shows on NBC ("Family Game Fight!"), FOX ('Masked Singer') and HBO ("Ellen's Next Great Designer") and the upcoming Tig Notaro animated comedy special).