Today - April 1st is celebrated worldwide as World Laughter Day.
According to Modern.az, this day, while more widely known as “April Fools' Day” globally, is fundamentally built on jokes, games, and briefly misleading people.
Thus, the tradition has continued for centuries in various countries under different names and with unique customs. Interestingly, although the exact origin date of this day has not been fully clarified, according to research from several sources, it was formed in France in the 16th century after calendar changes. With the New Year being moved from April 1st to January 1st, people who remained loyal to the old date were mocked, and over time, this turned into a day of jokes.

This tradition spread from Europe to various regions of the world and was named differently in each country. For example, in France, April 1st is known as “Poisson d’Avril,” meaning “April Fish.” Here, children and adults play pranks by sticking paper fish on each other's backs, and those who notice it exclaim “April Fish!” This is a simple tradition, and one that is particularly popular among children.

In Great Britain, however, the day has its own unique rule. Pranks are only played until 12 noon. After this time, anyone who plays a prank is considered a “fool” themselves. This has become a part of the tradition, especially in England.

In Germany and Scandinavian countries, this day is more noticeable in media and business environments. Newspapers, television channels, and large companies sometimes deliberately spread fabricated news, presenting information that misleads people. These types of pranks are sometimes so convincing that they are accepted as truth by a wide audience, and it is only later revealed that they were a joke.

In Scotland, however, this tradition is celebrated somewhat differently. Here, April 1st is called “Gowkie Day,” and the word “gowk” is used to mean a naive person. The tradition sometimes lasts for two days. While the first day is based on deceiving people, the second day is more remembered for “tail pranks,” meaning sticking various writings on people's backs.
In Brazil, this day is known as “Dia da Mentira,” meaning “Day of Lies.” Historically, there have even been instances where some newspapers published fake news on this day. This, in turn, aimed to test society's reaction on that day and simultaneously create an entertaining environment.

In the USA and other Western countries, April 1st is celebrated on a larger scale. Here, people play pranks on each other, and large companies and brands specifically introduce fictional products and spread unrealistic announcements on social networks. In some cases, these pranks attract the attention of millions of people and become a widely discussed topic.
One interesting point is that in Spain and some Latin American countries, a similar tradition is celebrated not on April 1st, but on December 28th. This day is known as “Day of the Innocents” and is very similar in content to "April Fools'" Day.
Despite different traditions in various countries, overall, this day is regarded as an opportunity for people to escape the stresses of daily life, laugh, joke with each other, and create a softer atmosphere in social interaction.