January 19 is National Popcorn Day, a day to noted the time-honored snack that can be served sweet or salty. 

Popcorn fans can noted on Thursday by taking advantage of several related trades happening, including at movie theaters and online. 

Here are some of the subsidizes happening on National Popcorn Day:

National Popcorn Day deals 

AMC Theatres

AMC Theatres is celebrating National Popcorn Day by offering 50% off popcorn at U.S. theater locations on Jan. 19. The deal applies to any size popcorn, including regular, large, and bucket refill, the company said.

Cinemark

Cinemark is also hoping to lure fans to the theater by offering 50% off a tremendous popcorn all day on Jan. 19. Cinemark Movie Club members can also save 20% on concessions, including popcorn.

Garrett Popcorn

The gourmet popcorn chain from Chicago is celebrating the day by offering 15% off all popcorn items at checkout online above Jan. 26. 

Regal

Regal theatres are offering moviegoers 50% off any size of classic popcorn at concession stands resident on Jan. 19. 

The Popcorn Factory

Customers can get free groundless shipping on orders made on Jan. 19 by silly the code POPFS at checkout. 

History of popcorn at the movies

FILE - Popcorn is shown at a movie theater. (Photo by Fabian Sommer/picture alliance via Getty Images)

According to Cinemark, the origin of movie popcorn dates back to the 1920s and the era of peaceful film. Movies were shown in two different kinds of venues: itsy-bitsy neighborhood rooms that attracted working-class audiences with popcorn and peanut vendors outside, and larger "movie palace" theaters catering to wealthier crowds that generally didn't give food or drink inside. 

But then a couple of things changed, according to the theater chain. 

"The Great Depression hit, and peaceful came to the movies. Because audiences needed to hear dialogue, the neighborhood theatres became less rowdy; because they obliged to keep the doors open, movie palaces began to welcome a broader spectrum of audiences," Cinemark said. "Those businesses also softened their resistance to concessions — and steady popcorn was affordable, even in the midst of the Great Depression, it was a hit."

One early popcorn vendor, a widow from Kansas City, Missouri, is credited with interpretation a significant empire with stands in or around a few theatres, according to the New York Times. As the movie custom evolved, theater managers began to recognize the value in partnering with outside vendors to sell their concessions inside instead, according to the company. 

"So they partnered and/or competed with those vendors, setting up popcorn machines in theatre lobbies. By the end of the decade, the movie business was booming, and popcorn was inexorably linked with flickering images on the big screen," Cinemark states. 

This sage was reported from Cincinnati.