Over the years, many television shows and sitcoms have been made for our entertainment.

While some have garnered a niche fan base, others have turned into money-making engines.

And other shows, such asThe SimpsonsandGreys Anatomy, are still running and making millions.

Michonne and Rick talking to two children outside in Walking Dead - Ones Who Live

Image via AMC

These shows arethe highest-grossing in television history.

How doesThe Real Housewivesmake its richest?

Through ads, of course.

The Walking Dead Season 11 Poster

This rakes in money, and that gravy-train isnt going to run dry anytime soon.

), butLaw & Orderis also a money-making machine.

To date, theLaw & Orderfranchise has earned over $4 billion, largely in syndication deals.

instar53510542.jpg

Its proof that a show doesnt need a streaming service to be profitable.

All you need is the justice system, and a cool theme.

instar53436553.jpg

Beth and Rip’s wedding in Yellowstone

Image via Paramount Pictures

Yellowstone Poster

instar53884447.jpg

instar37327245.jpg

Hugh Laurie, Geoffrey Blake and Heather Kafka leaning over Braeden Lemasters who is lying in a hospital bed in House episode Lines in the Sand

Image via Fox

House TV Series Poster

instar53643533.jpg

instar49049044.jpg

instar52950686.jpg

Sam (Jared Padalecki), Bela (Lauren Cohan), and Dean (Jensen Ackles) grab weapons in Supernatural.

Image via the CW

Supernatural TV Series Poster

instar51773569.jpg

instar49998862.jpg

The Griffin family opening presents in the Family Guy Christmas Hulu special

Image via Hulu

0340557_poster_w780.jpg

instar53603950.jpg

Cast Placeholder Image

The cast of ‘Real Housewives of Orange County’ watch through a window, Emily Simpson, Jennifer Pedranti, Tamra Judge, Heather Dubrow, Gina Kirschenheiter

Image via Bravo

The Real Housewives of Orange County Poster

The cast of ‘Law & Order’

Image via NBC

Law & Order

Eleven, with a bloody nose, and Dustin and Mike behind her on the floor at the mall, looking scared

Image via Netflix

Stranger Things Season 4 Poster

Michael (Steve Carell) shouts at Toby (paul lieberstein) in ‘The office’

Image via NBC

The Office Poster Michael Scott

George Clooney, Eriq La Salle, Laura Innes & Anthony Edwards standing over a patient in a hospital bed in ER.

Image via NBC

Friends