Et al means and others or it can mean and elsewhere. When used in citing a reference it often means there are multiple authors of the work cited and the citation is for the first author and the others. John Smith, et al would mean John Smith and his coauthors.
1 NEW YORK: The 39th annual Macy's Firework Show over the East River will last for 25 minutes and draw a crowd of over 3 million spectators. As the biggest firework display in the US, this year's show features more than 50,000 effects. 2  WASHINGTON, DC: Lasting over 17 minutes, this show is among the largest in the US.
WATCH: North America's largest firework detonated in Steamboat. The 48-inch shell was launched in February with 58 pounds of high explosives from a mortar buried 20 feet deep into a mountainside in Steamboat Springs. STEAMBOAT SPRINGS - In honor of the Fourth of July, check out the largest firework ever detonated in North America. At more than 1,175 pounds, it may be the heaviest ever set off in the world. The 48-inch shell was launched on February 6 as part of Steamboat's Winter Carnival.