【中文版】

同比增长是指某个指标在同一时期内的增长率与上一时期相比。具体来说，同比增长率是指本期数值与去年同期数值的差值与去年同期数值的比值。

例如，如果某公司今年3月份的销售额为100万元，去年同期的销售额为80万元，那么该公司的销售额同比增长率为：（100-80）/80*100%=25%。这意味着该公司的销售额比去年同期增长了25%。

同比增长率可以用于不同时间段的比较，比如日、周、月、季度、年等。通过同比增长率，人们可以了解某个指标在不同时间段的变化情况和发展趋势。

同比增长率在商业、经济、统计等领域中应用广泛。它可以用于分析市场趋势、预测未来发展、评估经济效益等。同时，同比增长率还可以用于不同地区、不同行业之间的比较，帮助决策者做出更加科学的决策。

需要注意的是，同比增长率并不是唯一的比较方式。除了同比增长率外，还有环比增长率、定基增长率等指标可以用于比较不同时间段的数据。同时，对于不同的指标和数据类型，应该采用不同的比较方式和计算方法，以便更好地反映实际情况。

【英文版】

Year-on-year growth refers to the growth rate of a certain indicator in the same period compared to the previous period. Specifically, the year-on-year growth rate is the difference between the current period value and the previous period value divided by the previous period value.

For example, if a company's sales in March of this year are 1 million yuan, and the sales in the same period last year are 800,000 yuan, then the year-on-year growth rate of the sales is (1 million - 800,000)/800,000*100% = 25%. This means that the company's sales have increased by 25% compared to the same period last year.

Year-on-year growth rates can be used for comparisons between different time periods, such as days, weeks, months, quarters, years, etc. Through year-on-year growth rates, people can understand the change and development trend of a certain indicator in different time periods.

Year-on-year growth rates are widely used in business, economy, statistics and other fields. It can be used to analyze market trends, predict future development, evaluate economic benefits, etc. At the same time, year-on-year growth rates can also be used for comparisons between different regions and industries, helping decision makers make more scientific decisions.

It should be noted that year-on-year growth rates are not the only way to compare. In addition to year-on-year growth rates, there are other indicators such as sequential growth rates and fixed base growth rates that can be used to compare data in different time periods. At the same time, different indicators and data types should use different comparison methods and calculation methods to better reflect the actual situation.