"Understand" is a song by British singer-songwriter, Melanie C. Written by Melanie C and Adam Argyle, it was released as the fifth and final single from the album This Time on 25 July 2008.

Melanie C announced in her official website, that "Understand" will be released in Canada as the second Canadian single from her album This Time.

The alternative version of the song, produced by Stephen Hague, was due to be released as a B-side with previous Melanie C's single "This Time" in the United Kingdom, Germany, Austria and Switzerland. However, due to a manufacturing error the original version was released instead. In response, Melanie offered the alternate track as a free download through her official website.

Melanie C mentioned during her appearance on the MuchMusic Video Awards 2008 that she would be using footage shot at the awards show for the music video of "Understand".

The music video was premiered on MuchMusic at 11:45am EST on Friday 25 July 2008. It featured Melanie meeting a guy in a subway station. Melanie and the guy ended up talking to each other in a restaurant. Footage used includes clips of her live shows from her Canadian Tour and her red carpet appearance on the MuchMusic Awards 2008 where she was greeted by a lot of crazy Melanie C fans.

Melanie C's potential love interest in the music video is played by Adam Crossley, a singer-songwriter who also supported Melanie during her Canadian tour. Melanie C described the music video as her "guerrilla marketing" video.

This is the format and track listing of the major single release of "Understand".

Melanie C performed the song on the following events:

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