Barack Hussein Obama was born on Aug. 4, 1961, in Honolulu. He's pictured here with his mother.
An image of Obama's parents, Barack Hussain Obama Sr. and Ann Dunham, from the 1960s. The couple divorced in 1964, and Dunham raised Obama as a single mother with the help of her parents.
Obama is pictured with his mother, grandfather and half sister Maya in Hawaii in the mid-1970s. He moved to Indonesia with his mother and her then-husband in 1967, then moved back to Honolulu in 1971 to live with his maternal grandparents. He remained in Hawaii until graduating from high school in 1979.
Obama began his undergraduate studies at Occidental College in Los Angeles, but transferred to New York's Columbia University in 1981. He graduated in 1983 with a degree in political science.
Obama began his work as a community organizer in 1985. Here he holds a meeting with citizens on the South Side of Chicago.
Obama met Michelle Robinson, his future wife and the first lady,in 1989 at Chicago's Sidley Austin law firm, where he was a summer intern and she his adviser. Here, they are pictured in Kenya in 1992.
The couple was married on Oct. 3, 1992.
"Dreams from My Father," Obama's book about race relations that turned into a personal memoir, was published in mid-1995.
Obama was elected to the state Senate in Illinois in 1996, serving until he ran for higher office in 2004.
Obama's first daughter, Malia (left), is born on June 4, 1998. His youngest daughter, Sasha, is born three years later in 2001.
In 2004, Obama electrified the Democratic National Convention with a keynote address that would make him a rising star in the party.
Obama was elected to the U.S. Senate in 2004, serving until he ran for president in 2008.
Obama won Best Spoken Word Album Grammy Awards for abridged audiobook versions of "Dreams from My Father" in February 2006 and for his second book, "The Audacity of Hope," in February 2008.
In February 2007, Obama announced his candidacy for president in front of the Old State Capitol building in Springfield, Illinois.
Obama made history with his presidential election in 2008, becoming the first African-American to lead the country.
On Feb. 17, 2009, Obama signed the $787 billion economic stimulus package into law in Denver. The bill aimed to boost the nation's stagnant economy and was the first major legislative action taken during his first tenure as president.
On Dec. 10, 2009, Obama received the Nobel Peace Prize in a controversial decision that riled conservatives. In remarks that seemed to acknowledge the award was premature, Obama said the prize was a "call to action" rather than a recognition of his work.
In what's become known as "Obamacare," the president signed his health care reform law into effect on March 30, 2010. The messy politics of the measure has drawn legal challenges and inspired the tea party insurgence in the 2010 midterm elections.
On Aug. 31, 2010, Obama goes on national TV to declare an end to conflict in Iraq during a national address from the Oval Office.
Obama leads a briefing on the situation in Libya in this photo taken aboard Air Force One on March 21, 2011. After weeks of calling on dictator Muammar Gaddafi to end his attacks on the Libyan opposition, the president announced that U.S. military intervention had begun.
In this now famous photo, Obama watches the U.S. military raid on Osama bin Laden's compound in Pakistan on May 1, 2011, with members of his security team. That evening, the president announced the death of the 9/11 mastermind to the nation in a televised address.
Obama made history in May 2012, when he become the first sitting president to openly support same-sex marriage. He announced his stance in an interview with ABC's Robin Roberts.
On Nov. 6, 2012, Obama was elected to a second term as president, beating Republican Mitt Romney with 332 electoral votes and 51 percent of the popular vote.
In what's become another seminal moment in his presidency, Obama wipes away a tear while addressing the school shooting in at Sandy Hook Elementary School in Newtown, Connecticut, in December 2012 that killed 20 children and six staff members.
Numerous setbacks and scandals have cast a cloud over Obama's second term, such as the National Security Agency spying scandal and IRS emails showing the agency discriminated against conservative groups. His current approval rating is among the lowest in presidential history.