The world's largest economies are often measured by their gross domestic product (GDP), which estimates the total value of goods and services produced within a country during a specific period, usually a year. GDP helps determine a country's economic size and its global impact. While economies rise and fall, the top economies typically hold their positions over time, despite challenges.

Here's a look at the top 10 economies based on nominal GDP:

1. United States

Nominal GDP: USD 28.78 trillion
GDP Growth: 2.7%
GDP per Capita: USD 85,370

The United States has the largest economy in the world, with a dominant service sector that includes finance, insurance, healthcare, and real estate. Its relatively open economy attracts both domestic and foreign investments. While the U.S. is at the forefront of technological innovation, it faces challenges like economic inequality, rising healthcare costs, and aging infrastructure.

2. China

Nominal GDP: USD 18.53 trillion
GDP Growth: 4.6%
GDP per Capita: USD 13,140

As the second-largest economy, China’s rapid growth over the last two decades has sparked discussions about its potential to surpass the U.S. in the future. A shift from collectivized agriculture to a more market-oriented economy has propelled China to become the world’s largest exporter. However, an aging population and environmental challenges threaten its growth.

3. Germany

Nominal GDP: USD 4.59 trillion
GDP Growth: 0.2%
GDP per Capita: USD 54,290

Germany is Europe's largest economy, excelling in exports of machinery, vehicles, and chemicals. While its economy benefits from a skilled workforce, demographic issues, like a declining birth rate, threaten future growth. The high levels of immigration, though beneficial in some areas, also strain the social welfare system.

4. Japan

Nominal GDP: USD 4.11 trillion
GDP Growth: 0.9%
GDP per Capita: USD 33,140

Japan's economy thrives on advanced manufacturing and exports. Despite facing challenges like a rapidly aging population and reliance on imported energy, Japan remains a global economic powerhouse. The country’s unique business networks, known as keiretsu, contribute to its resilience.

5. India

Nominal GDP: USD 3.94 trillion
GDP Growth: 6.8%
GDP per Capita: USD 2,730

India has become the 5th-largest economy, but its per-capita GDP remains low. It benefits from a diverse economy that blends agriculture, industry, and services. The technology services and outsourcing sectors are major contributors to its economic growth. However, challenges like corruption and poverty persist.

6. United Kingdom

Nominal GDP: USD 3.5 trillion
GDP Growth: 0.5%
GDP per Capita: USD 51,070

The U.K. is driven by its robust service sector, particularly finance and business services. Post-Brexit, the country faces complex trade negotiations with the European Union, but its economic ties to the U.S. and the global market continue to support growth.

7. France

Nominal GDP: USD 3.13 trillion
GDP Growth: 0.7%
GDP per Capita: USD 47,360

France ranks seventh globally, with a diversified economy that includes a strong tourism sector. While the government maintains a significant role in key industries, challenges such as high unemployment and public debt hinder further growth.

8. Brazil

Nominal GDP: USD 2.33 trillion
GDP Growth: 2.2%
GDP per Capita: USD 11,350

Brazil is the largest economy in South America, with a mix of industries, including energy, agriculture, and manufacturing. After recovering from a deep recession, Brazil has reformed its economy to attract investment and reduce public debt, though it continues to struggle with political instability.

9.Italy

Nominal GDP: USD 2.33 trillion
GDP Growth: 0.7%
GDP per Capita: USD 39,580

Italy’s economy varies significantly by region, with the north being more industrialized than the south. Challenges include high public debt, an inefficient banking sector, and a sluggish labor market that affects growth.

10.Canada

Nominal GDP: USD 2.24 trillion
GDP Growth: 1.2%
GDP per Capita: USD 54,870

Canada is known for its natural resources, particularly oil, and has a strong manufacturing and service sector. Its close trade relationship with the U.S. supports its economy, making it highly integrated into the North American market.