It is called differently. in Turkey - Labor and Solidarity Day, in Austria - International Workers' Day, Germany and Bulgaria - Labor Day.
Initially, May 1 is International Workers' Day.
For a long time, May Day was a symbol of revolution, an irreconcilable class struggle, had a "political coloring" and was marked by demonstrations decorated with portraits of political figures, leaders in production, slogans, appeals, posters and diagrams about achievements in one or another branch of the national economy, science, culture. But gradually this context was lost.
On May 1, 1886, American workers went on strike demanding an 8-hour day. The strike and accompanying demonstration ended in a bloody clash with the police.
In July 1889, the Paris Congress of the Second International, in memory of the action of the workers of Chicago, decided to hold annual demonstrations on May 1. For the first time the day of international solidarity of workers was celebrated in 1890 in Austria-Hungary, Belgium, Germany, Denmark, Spain, Italy, USA, Norway, France, Sweden and some other countries. For a long time May Day was a symbol of the revolution, the irreconcilable class struggle.

Today this holiday is celebrated in 142 countries and territories of the world on May 1 or on the first Monday of May. For a number of countries, the tradition of gathering people under the banner of trade unions has still been preserved, but in most states this is still not a political holiday, but Labor Day, a bright spring holiday, when folk festivals, performances by artists, fairs, peaceful processions and many entertainment events are organized. And for some, it's just another day off, during which you can just relax or spend time with your family.
By the way, in some countries Labor Day is celebrated at a different time - these include, for example, the USA and Japan. More than 80 countries (including India) do not celebrate Labor Day.