Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician who served as the 46th president of the United States from 2021 to 2025. A member of the Democratic Party, he represented Delaware in the United States Senate from 1973 to 2009 and also served as the 47th vice president under President Barack Obama from 2009 to 2017.

Born in Scranton, Pennsylvania, Biden graduated from the University of Delaware in 1965 and the Syracuse University College of Law in 1968. He was elected to the New Castle County Council in 1970 and the U.S. Senate in 1972. As a senator, Biden chaired the Senate Judiciary Committee and Foreign Relations Committee. He drafted and led passage of the Violent Crime Control and Law Enforcement Act and the Violence Against Women Act. Biden also oversaw six U.S. Supreme Court confirmation hearings, including contentious hearings for Robert Bork and Clarence Thomas. He opposed the Gulf War in 1991 but voted in favor of the Iraq War Resolution in 2002. Biden ran unsuccessfully for the 1988 and 2008 Democratic presidential nominations. In 2008, Obama chose him as his running mate, and Biden was a close counselor to Obama as vice president. In the 2020 presidential election, Biden selected Kamala Harris as his running mate, and they defeated Republican incumbents Donald Trump and Mike Pence.

As president, Biden signed the American Rescue Plan Act in response to the COVID-19 pandemic and subsequent recession. He signed bipartisan bills on infrastructure and manufacturing. Biden proposed the Build Back Better Act, aspects of which were incorporated into the Inflation Reduction Act that he signed into law in 2022. He appointed Ketanji Brown Jackson to the Supreme Court of the United States. In his foreign policy, the U.S. reentered the Paris Agreement and enacted the New Atlantic Charter. Biden oversaw the complete withdrawal of U.S. troops that ended the war in Afghanistan, leading to the Taliban seizing control. He responded to the Russian invasion of Ukraine by imposing sanctions on Russia and authorizing aid to Ukraine. During the Gaza war, Biden condemned the actions of Hamas as terrorism, strongly supported Israel, and sent limited humanitarian aid to the Gaza Strip. A temporary ceasefire proposal he backed was adopted shortly before his presidency ended.

Concerns about Biden's age and health persisted throughout his presidency. He became the first president to turn 80 years old while in office. He began his presidency with majority support, but saw his approval ratings decline significantly throughout his presidency, partially due to public frustration over inflation, which peaked at 9.1% in June 2022 before dropping to 2.9% by the end of his presidency. Biden initially ran for reelection and, after the Democratic primaries, became the party's presumptive nominee in the 2024 presidential election. After his performance in the first presidential debate, renewed scrutiny from across the political spectrum about his age and health led him to withdraw his candidacy. In 2022 and 2024, Biden's administration was ranked favorably by historians and scholars, diverging from unfavorable public assessments of his tenure. He is the oldest living former U.S. president and the oldest person to have served as president.

Joseph Robinette Biden Jr. was born on November 20, 1942, at St. Mary's Hospital in Scranton, Pennsylvania, to Catherine Eugenia "Jean" Biden (née Finnegan) and Joseph Robinette Biden Sr. He is the oldest child in a Catholic family of mostly Irish descent. Biden has a sister, Valerie, and two brothers, James and Francis.

Joseph Sr. had been wealthy, and the family purchased a home in the affluent Long Island suburb of Garden City, New York, in 1946. After he suffered business setbacks around the time Biden was seven years old, the family lived with Jean's parents in Scranton for several years. Scranton fell into economic decline during the 1950s, and Joseph Sr. could not find steady work. Beginning in 1953, when Biden was ten, the family lived in an apartment in Claymont, Delaware, before moving to a house in nearby Mayfield, Delaware. Joseph Sr. later became a successful used-car salesman, maintaining the family in a middle-class lifestyle.

At Archmere Academy in Claymont, Biden played baseball and was a standout halfback and wide receiver on the high school football team. Though a poor student, he was class president in his junior and senior years. He graduated in 1961. At the University of Delaware in Newark, Biden briefly played freshman football and received a Bachelor of Arts degree with a double major in history and political science in 1965.

Biden married Neilia Hunter, a student at Syracuse University, on August 27, 1966, after overcoming her parents' disinclination for her to wed a Catholic. Their wedding was held in a Catholic church in Skaneateles, New York. They had three children: Joseph R. "Beau" Biden III, Robert Hunter Biden, and Naomi Christina "Amy" Biden.