Modern Western theatre comes, in large measure, from the theatre of ancient Greece, from which it borrows technical terminology, classification into genres, and many of its themes, stock characters, and plot elements. Theatre artist Patrice Pavis defines theatricality, theatrical language, stage writing and the specificity of theatre as synonymous expressions that differentiate theatre from the other performing arts, literature and the arts in general.

Modern theatre includes performances of plays and musical theatre. The art forms of ballet and opera are also theatre and use many conventions such as acting, costumes and staging. They were influential to the development of musical theatre; see those articles for more information.

Theatre (British English and also American English), or Theater (mostly American English), has several meanings.

The word comes originally from the Greek Theatron, meaning roughly, 'a place to behold'. In American English, the word 'theater' can mean either a place where films are shown (this is also called a cinema) or a place where live stage plays are performed. In British English, 'theatre' means a place where live plays are performed. Some people, both English and American, use the spelling 'theatre' to mean a place where live plays are performed, and the spelling 'theater' to mean a cinema.

'Theatre' can also mean the business of putting on plays. An actor might say "I am in the theatre business", or a writer might say "I write for the theatre", meaning that they write plays, rather than writing for movies or television shows.

As a life science and social art, theater appears before the public as a result. However, as well as being a result, theater has the quality of being a tool. The unity of the theater and its being a tool reveals an educational resource.

Each year an outstanding figure in theatre or a person outstanding in heart and spirit from another field is invited to share his or her reflections on theatre and international harmony. What is known as the International Message is translated into more than 50 languages, read for tens of thousands of spectators before performances in theatres throughout the world, and printed in hundreds of daily newspapers. Colleagues in the audio-visual field lend a fraternal hand, with more than a hundred radio and television stations transmitting the Message to listeners in all corners of the five continents.

Initiated in 1961 by the International theater Institute (ITI), each year theaters across the world celebrate the value and importance of theater, and this holiday acts as a wake-up call for governments, politicians, and institutions to see its value to society and for economic growth. ITI also host a yearly message, spoken by a chosen famous theater performer, to share their reflections on the art of theater and its future. The first of those messages were spoken by Jean Cocteau in 1962.

This message is translated into over 50 languages, read for thousands of spectators, and printed in hundreds of newspapers. It also spreads the message by broadcast to all corners of the world through their institutions. Because ITI has over 90 centers throughout the world, the institute also encourages colleges, schools, and theater professionals to celebrate this holiday as well.

The date of this holiday also corresponds with the opening of the Theater of Nations season in Paris. The goals of this holiday, according to ITI, is to promote theater in all corners of the world, bring awareness to the value of theater in all its forms, to help promote local theater communities on a broader scale, and to share the love of theater with others.

“Theatre is the art form of the present: it exists only in the present, and then it’s gone.” – Simon McBurney

“The theatre is certainly a place for learning about the brevity of human glory: oh all those wonderful glittering absolutely vanished pantomime.” –Iris Murdoch

“Acting is a matter of giving away secrets.”- Ellen Barkin

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https://www.actingstudiochicago.com/

Messages about "The World Theatre Day"(Tuna Güven ):
https://www.world-theatre-day.org/
https://www.spurcreative.co.uk/

Why we celebrate "World Theater Day" & Events on "The World Theatre Day" (Poyraz Genç ):
https://www.pexels.com/
https://www.world-theatre-day.org/

What is "The World Theatre Day" ? & History of World Theater Day (Mehmet Emir Şimşek ):
https://www.world-theatre-day.org/worldtheatreday.html
https://en.wikipedia.org/wiki/World_Theatre_Day