El Salvador's adoption of Bitcoin as legal tender is a significant development in the cryptocurrency world. It officially began on September 7, 2021, when the country's Bitcoin Law came into effect, making it the first country to adopt Bitcoin as legal tender. This means that businesses must accept Bitcoin alongside the US dollar, the country's official currency.

The decision was led by President Nayib Bukele, who argued that Bitcoin could provide financial inclusion to the unbanked population and reduce remittance costs. However, the move has been met with criticism and concerns about Bitcoin's volatility, potential legal issues, and its impact on the country's economy.

El Salvador's journey with Bitcoin as legal tender is ongoing, and its success or challenges will likely shape the future of cryptocurrency adoption by other nations.