Breakthrough is the second studio album by American singer-songwriter Colbie Caillat. The album was released on August 19, 2009 through Universal Republic Records. The follow-up to her successful debut album, Coco (2007), Breakthrough was developed in late 2008 when Caillat returned to her home after two years on tour, with the singer setting up a "writing camp" with songwriters and producers in Hawaii and writing over 40 songs for the record.

Inspired by the fact that she was trying to find herself again and breaking the creativity chains that surrounded her, Breakthrough deals with themes of growing up, experiencing life, love, making mistakes and learning from them, as well as heartbreak and why everlasting love seems elusive. To help develop her expected sound and lyrics, Caillat worked with previous collaborators, such as Mikal Blue, Ken Caillat and Jason Reeves, while working for the first time with Kara Dioguardi, Rick Nowels, John Shanks, Greg Wells and David Becker.

Breakthrough received generally mixed to favorable reviews from contemporary music critics, with some praising its rich texture and for being a consistent album with catchy tracks, while others dismissing its title and finding issues with some of the song's lyrics. The album was nominated for Best Pop Vocal Album at the 52nd Grammy Awards. Commercially, it was successful in the United States, debuting at number one on the Billboard 200, selling 106,000 copies in its first week, becoming her first album to top the Billboard charts. Elsewhere, it reached the top-ten in four countries, while failing to replicate the success of her debut album in other territories.

The album produced two singles. The first single, "Fallin' for You", was released on June 29, 2009 and was a success on the Billboard Hot 100, reaching number twelve, while also finding success on the Adult radio. Elsewhere, it was a moderate hit. The second single, "I Never Told You", was released on February 16, 2010, and found similar success on the Adult charts, while being more moderate on the Billboard Hot 100. To promote the record, Caillat embarked on her Breakthrough World Tour (2009-2010).

After the success of her debut album, Coco (2007), which sold over five million copies worldwide and spawned her biggest hit, "Bubbly", Caillat went on tour for two years to promote the record. At the end of the album's promotion and the tour, Caillat went home and realized she had to find herself again. According to herself, "It requires a lot of discipline to open yourself up to new influences and break the chains around you creatively. I must say this process has been the greatest learning experience for me. It's so great to be working and writing in new ways, with old friends and new." At first, she recorded a few tracks with her dad and producer Ken Caillat, however her label wasn't thrilled with the outcome and wanted new producers to rework the tracks. In November 2008, she went to the studio for the first time with songwriter and record producer Rick Nowels and did five songs with him. In early 2009, to achieve her desired sound, Caillat set up a "writing camp" in Kauai's Hanalei Bay in Hawaii and invited such colleagues as Jason Reeves and Mikal Blue, who co-produced her first album, Coco, as well as experimented working with new songwriters and producers such as Kara Dioguardi, John Shanks and Greg Wells. According to the singer, "We'd go out boogie-boarding and then come back and write songs. [...] We just wanted to be inspired by everything." In total, Caillat worked with them in over 40 songs between 2008 and 2009.

I've taken this time to look back at where I was and realized I've broken through a personal barricade, which is why I've named the album 'Breakthrough.'

Breakthrough was defined as an album about growing up, experiencing life, love, making mistakes and learning from them, with particular emphasis on love and making mistakes, with "most of the mistakes Caillat chronicles have to do with matters of the heart", as noted by Plugged In (publication)'s Adam R. Holz. Caillat stated that she "wanted to make music that people could listen to while driving on a long road trip, while dancing at a party with friends, while laying out at the beach or sitting at their desk at work. I wanted to give people songs that they could fall in love to, lay down & cry to, songs & stories that they can relate to so they feel like they aren't the only ones going through whatever it is they are going through in life. Music is for you to listen to & forget about your worries. These songs can mean whatever you want them to mean, they are now yours." She further elaborated over the album's themes and the inspiration behind it, explaining:

"I recently learned something about myself. For a lot of us, when life gets hard to deal with & keep up with, it becomes easier to give up on & let go of. I found myself doing that a lot & I was slowly falling apart. But...I woke up from it. I realized I wasn't happy settling for less or letting myself become someone I wasn't supposed to be due to laziness. I had to Breakthrough my fears, my insecurities & my self doubt. There are so many battles that we all have to go through in life that are for us to learn from, we grow stronger from them. I just learned this. I want to remind myself & everyone out there that we have to Breakthrough all the little things we tell ourselves we can't do because we are scared, & just step up & do them. This record is about becoming the person you want to be, having will power & letting nothing hold you back. So try not to let great things pass you by, start making things happen that you really want in life!."