Cook was interested in music from a young age and began singing when in second grade. At the age of 13, he received his first guitar, a Fender Stratocaster. Initially, he performed in choir and drama programs while in middle school and high school.
Later, he joined Blue Springs South High School. He began performing there in musicals like The Music Man, West Side Story, and Singin' in the Rain. Additionally, he also played football for his high school and has been qualified for the national tournament twice for duo interpretation. He graduated from the same school in 2001.
While Cook was in his high school, he was also an avid baseball player but later, he became injured and began to focus on music instead. Subsequently, he earned a theater scholarship to the University of Central Missouri, but he dropped out after two semesters graduating from the school in 2006 with a degree in graphic design.
At the beginning of his career, Cook formed a band called Red Eye together with his friend Bobby Ker. Later, he changed the name of his band to Axium. At the age of 15, he wrote his first song "Red Hot". The band produced three hit studio album including Matter of Time, Blindsided, and The Story Thus Far.
On May 21, 2008, Cook became the winner of the seventh season of American Idol by receiving 56 percent of the votes, 12 million votes over David Archuleta, the runner-up. After that, he sang a song The Time of My Life, which lead him to more popularity. Some of his most notable songs and albums are David Cook, This Loud Morning, Digital Vein, and Chromance.
Regarding his nationality and ethnicity, Cook is a white American. In May 2008, he invited Kimberly Caldwell, a Season 2 American Idol alum and TV Guide Network correspondent for a dinner date. However, the couple ended their relationship in December 2008.
On June 20, 2015, Cook married his longtime girlfriend Racheal Stump in a private ceremony in Nashville. The couple has not shared any information regarding their children. He lives a happily married life together with his wife and there are no rumor of divorce.
As a popular singer and American Idol winner, he earns a tremendous amount of money. He has released numerous songs and albums from which he must have collected a decent amount as a salary. As per the report in 2018, his net worth is calculated to be $5 million.