It means how much energy was burned.

The calorie (calorie) is the unit of energy that is still widely used in nutritional measurements and fitness manuals, and the international standard unit of energy is the joule (joule). As the legal unit of food calories, the joule is commonly used in Europe and the calorie in the United States. Although the joule is the legal unit in China and Taiwan, however, calories are still widely used in China and Taiwan due to the tradition that has been followed.

Expanded Information:

The total calorie intake of the human body per day is about 1,800 to 2,000 kilocalories. The total amount of calories consumed is about 1/7 of the total calorie intake. for most people, excluding the calories consumed in normal life (about 1,500 to 1,700 kilocalories), 10,000 steps a day is just enough to burn off the excess calories.

To say that there is a movement can prevent disease and fitness, at the same time safe and reliable, muscle and ligament injury probability is very small; and simple and easy to carry out, do not need special sports equipment, and young and old, then, this movement is deservedly - walking.

Baidu Encyclopedia - Calories

People's Daily 10,000 steps to consume excess calories