The World Bank classifies countries into four income groups based on average income per person. This article explains how these groups are defined.<br><br><a href="https://ourworldindata.org/world-bank-income-groups-explained" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/d4cdc240-17cd-4e8c-31e3-d1d197547600/w=1350"/></a>

Learn more about different options for embedding our interactive charts.<br><br><a href="https://ourworldindata.org/new-feature-embed-archived-charts" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/7eedca36-daec-4abd-5f19-a87de6a05a00/w=1350"/></a>

Mobile money allows people without banks to securely transfer funds via text message, and its adoption is growing rapidly.<br><br><a href="https://ourworldindata.org/mobile-money-why-it-matters" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/c18c6704-95a3-4757-6f5a-7036d5b86400/w=1350"/></a>

In the 1980s, many thought tuberculosis was on the path to elimination. In reality, more were dying from the disease than ever.<br><br><a href="https://ourworldindata.org/the-end-of-tuberculosis-that-wasnt" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/b5aa8c82-2fc4-4e0a-cdf1-82d5aa6f9800/w=1350"/></a>

For billions, it can mean hours spent collecting water. For almost a million, it means dying from disease.<br><br><a href="https://ourworldindata.org/what-no-safe-water-means" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/59c8ad10-ac08-4179-3186-1b2bac060c00/w=1350"/></a>

Measles causes more than an acute illness: it suppresses immune memory and increases the risk of complications for years.<br><br><a href="https://ourworldindata.org/measles-increases-disease-risk" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/b2168626-1df5-419a-7709-f57955f46800/w=1350"/></a>

Learn what’s new and try it out yourself.<br><br><a href="https://ourworldindata.org/new-features-better-maps" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/8da19868-55c1-4da5-377d-63174a202d00/w=1350"/></a>

Before the 1970s, most children affected by leukemia would quickly die from it. Now, most children in rich countries are cured.<br><br><a href="https://ourworldindata.org/childhood-leukemia-treatment-history" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/28a0ccf8-4618-4822-638f-ea8143e06000/w=1350"/></a>

As much as one-quarter of deaths in Europe and the United States were once from tuberculosis.<br><br><a href="https://ourworldindata.org/tuberculosis-history-decline" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/21b69f06-f8eb-4618-a3ed-401b8af6d300/w=1350"/></a>

International dollars are used to compare incomes and purchasing power across countries and over time. Here, we explain how they’re calculated and why they’re used.<br><br><a href="https://ourworldindata.org/international-dollars" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/95f674ac-5e7c-4474-6493-9a5578eb2a00/w=1350"/></a>

Measles once killed millions every year. Vaccines changed this, preventing disease, long-term immune damage, and deadly outbreaks.<br><br><a href="https://ourworldindata.org/measles-vaccines-save-lives" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/5f66d86d-91f5-4839-caa7-d6c5ce64e300/w=1350"/></a>

It’s difficult to compare countries because they don’t always measure infant mortality in the same way.<br><br><a href="https://ourworldindata.org/where-are-babies-at-lowest-risk-of-dying" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/39d23685-afc7-46b8-2018-8813c041c100/w=1350"/></a>

In most rich countries, child mortality has more than halved in the last thirty years; we know we can go further.<br><br><a href="https://ourworldindata.org/child-mortality-rich-countries-decline" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/0f13d2cd-7f47-4f84-22a3-b1014dd1e500/w=1350"/></a>

A story of how our work helps journalists who use data.<br><br><a href="https://ourworldindata.org/how-journalist-the-economist-uses-owid" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/f403b7ed-e0ba-4614-0740-2f546e3d3100/w=1350"/></a>

Data from large meta-analyses show that measles vaccination is highly effective and safe, giving a 95% reduction in the risk of measles.<br><br><a href="https://ourworldindata.org/measles-vaccine-effectiveness-safety" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/1d042616-0031-4929-ef74-a0d7a3176000/w=1350"/></a>

Foreign aid measurement is complicated — what exactly counts as Official Development Assistance, what doesn’t, and how much is actually spent abroad?<br><br><a href="https://ourworldindata.org/what-is-foreign-aid" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/45c115b3-453b-4d01-6ded-31b0e8570700/w=1350"/></a>

A breakdown of the sources of many air pollutants that damage our health and ecosystems.<br><br><a href="https://ourworldindata.org/air-pollution-sources" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/5a98a347-7411-40c8-4c1b-30a542d22f00/w=1350"/></a>

In many countries, a significant share of aid is spent domestically on hosting refugees, offering student scholarships, and administrative costs.<br><br><a href="https://ourworldindata.org/foreign-aid-domestic-overseas" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/78a7ce1c-2086-4716-c5dc-30f130bbee00/w=1350"/></a>

Most countries spend less than 1% of their national income on foreign aid; even small increases could make a big difference.<br><br><a href="https://ourworldindata.org/foreign-aid-donations-increase" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/486658e7-cc1e-4bed-f5a7-4c66b7ced500/w=1350"/></a>

The world is warming despite natural fluctuations from the El Niño cycle.<br><br><a href="https://ourworldindata.org/global-temperatures-el-nino-la-nina" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/40c0d7fb-f503-45b1-8eda-8cc001f4dd00/w=1350"/></a>