Baby is a song by Canadian singer Justin Bieber, featuring vocals from American rapper Ludacris. It was released on January 18, 2010, as the lead single from Bieber's debut studio album, My World 2.0 (2010). The song is a dance-pop song with a moderate tempo. The lyrics of the song are about a young man who is in love with a girl and how he is willing to do anything to be with her.

Baby was a commercial success, reaching number one in over 15 countries, including the United States, Canada, and the United Kingdom. The song was also certified 13x platinum by the Recording Industry Association of America (RIAA).

The song received generally favorable reviews from music critics, who praised Bieber's vocals, Ludacris's verse, and the song's catchy melody. The song was also nominated for a Grammy Award for Best Pop Collaboration with Vocals.

The song's music video was directed by Ray Kay and features Bieber and Ludacris performing the song in a variety of locations, including a house, a pool, and a club. The music video has been praised for its visuals and its ability to capture the song's youthful energy.

Here are some of the reasons why Baby is such a popular song:

The song's catchy melody is easy to remember and sing along to.
The song's lyrics are relatable to many young people who are in love.
Bieber's vocals are smooth and soulful.
Ludacris's verse is catchy and adds to the song's energy.
The song's music video is visually stunning and captures the song's youthful energy.
v Baby is a great example of a dance-pop song that has all the elements of a hit. It's catchy, youthful, and has a great message. If you're looking for a new song to add to your playlist, I highly recommend checking out Baby.

Here are some additional details about the song:
The song was written by Bieber, Ludacris, and The-Dream.
The song's title is a reference to the phrase "baby," which is often used to express affection or love.
The song's music video was filmed in Miami and features Bieber and Ludacris performing the song in a variety of locations.
The song has been covered by many artists, including Cody Simpson, One Direction, and Carly Rae Jepsen.