UNESCO holds that food is an edible substance that requires chewing before swallowing. But setting aside this dry, official definition, food for us is a symbol of pleasure and recreation. The pleasure of arriving home hungry and smelling the aroma of food. Going to a restaurant with family and friends. The pleasure when the courier rings the doorbell and puts the paper bag in our hands. The pleasure of sneaking over to the stove and sampling the food. The pleasure of tasting a new dish while traveling. In fact food is not only a vital substance but an important marker in our culture and lifestyle. In the modern period food has become an industry and a criterion for the development of cities and countries. With food becoming an industry, large international companies and restaurants formed in the food sphere.

McDonald's|McDonald's
The McDonald's brand is the world's largest and most successful fast-food chain restaurant. This brand is one of the top and best-known brands in the food industry and is on the list of one hundred companies among the world's best-known chain restaurants by market value. This fast-food chain currently has more than forty thousand branches around the world. The value of this brand is nearly 200 billion US dollars. The largest number of McDonald's branches in Europe belongs to France and in Asia to China. Throughout Britain, McDonald's is the most popular food brand. This restaurant chain is at the top of the list of the world's best quick-service restaurant ( QSR ) fast-food restaurants. After it come the Starbucks and KFC brands. The global revenue of this restaurant chain exceeds 23 billion dollars. Both in revenue and in number of branches, McDonald's overall has slow, steady growth. Growth that COVID was able to confront with a temporary decline.
McDonald's marketing strategies
McDonaldization, the method the McDonald's brand uses in running its branches, has become a model for many of the world's large chain restaurants. This method is also examined in sociology under the title McDonaldization. This term arose because all McDonald's chain restaurants in every part of the world followed entirely identical principles and were intensely homogeneous and alike. The particular accounting by which all McDonald's branches operate means the customer knows the quality of their food has not differed from the past or from a branch in another country. McDonaldization is one of the symbols of globalization. Many organizations try to be like McDonald's: fast, calculable, aligned with clients' expectations and predictions, and based on specified, fixed standards.

Starbucks|Starbucks
Coffee and the coffeehouse have a special place in history. The coffeehouse in Iran has been a place for socializing. In the bazaars of Baghdad, Damascus, and Beirut one can still find a maqha where dallahs, or Arabic coffee pots, sit on hot ashes for brewing coffee. Today, too, in most modern cities there are a large number of cafes. Even so, nowhere in the world can one find a phenomenon like Starbucks.
The Starbucks brand, the giant of the world's coffee industry, is a coffee-shop chain with 35 thousand branches around the world that is worth 165 billion US dollars. If you ask Starbucks customers they would probably add another sentence: drinks tastier than all the hot and cold drinks in the world. Because, like many coffee shops, Starbucks has not confined itself to selling various types of coffee. Various smoothies, hot chocolate, and cold drinks are also among this chain cafe's popular products. Starbucks is also active in food sales but has the least revenue generation from this source. The Starbucks brand's success is owed to extensive advertising. Starbucks' global marketing and advertising costs in 2022 reached 416 million US dollars.

KFC|KFC
The KFC brand was founded in 1952 CE, corresponding to 1330 (1951/52) solar. It currently ranks third among the world's best fast-food restaurants. This is the sentence that reliable statistical sources say about KFC. This phrase is short for Kentucky Fried Chicken. With its fried chicken, KFC has been able to have branches in 150 countries of the world, and the number of KFC branches has reached nearly 28 thousand. KFC has 820 thousand employees who make up its empire.
In the very year KFC was founded, on one of the roads of Mazandaran Province, a cook named Aliakbar Kolbadinejad together with his wife established a restaurant. This restaurant is seen throughout Iran today and is called the Akbar Joojeh chain restaurants. Akbar Joojeh's chickens and KFC's chickens, the world's most appealing fried chicken, have many similarities. Fans of Akbar Joojeh, of course, never prefer Kentucky chicken, but the distance between these two brands is still very large.

Burger King|Burger King
Two years had passed since the founding of Kolbadi's Akbar Joojeh restaurant and the KFC restaurant when a new phenomenon appeared in the food industry. Every day that passes, the choice of 15 million people around the world is to buy their dinner or lunch from Burger King. These fifteen million people are spread among more than 100 different countries but are mostly American. Because of Burger King's 18 thousand and 700 branches, 7 thousand branches are located in this country. This restaurant chain has 2 billion dollars in annual revenue. The Burger King brand is the world's seventh-largest fast-food chain. This large restaurant is not indifferent to the world of politics either, and following the outbreak of the Russia–Ukraine war, it suspended Burger King branches in Russia.

Even so, the Burger King brand's sales have been declining over the past ten years. The peak of this fast food's legendary sales relates to 2013. In this year the Burger King restaurant had 222 million dollars in sales. But from later years, this chain's sales suddenly fall to one-third. Burger King's worst sales years were 2020 and 2022. This chain fast food in 2022, with 6 million dollars of growth relative to the previous year, had 70 million dollars in sales.

Conclusion
The food industries today have taken the form of a fully developed industry. It has its own particular tools and technologies, it has prominent, well-known brands, and a remarkable turnover of money is seen in it. Some of the world's well-known food brands, and especially the fast-food industry, include McDonald's, Starbucks, KFC, and Burger King. McDonald's style and method of business in running a large chain restaurant has led to the creation of the concept of McDonaldization in sociology. This concept means an organization, institution, or society that has a fixed, orderly, and fast function. Also, a large chain restaurant such as Burger King sees its importance to the point of sanctioning Russia when the Ukraine war occurred. Starbucks is also the world's largest coffee-related cafe chain. This best coffee-shop brand, despite its fame, still spends a great deal on advertising and marketing.
Machine-translated from Persian by Namafar; the Persian original is authoritative. Read the original in Persian