Answer by taking a quote from the following article:

N.E.R.D (stylized as N*E*R*D, a backronym of No-one Ever Really Dies) is an American hip hop and rock band, formed in Virginia Beach, Virginia in 1999. Pharrell Williams and Chad Hugo were signed by Teddy Riley to Virgin Records as a duo, The Neptunes. After producing songs for several artists throughout the late 1990s and early 2000s, the production duo formed the band with Shay Haley as a side project of The Neptunes in 1999.

In 2010, N.E.R.D announced the release of their fourth studio album entitled Nothing, which had a scheduled release date for September 7, 2010, but was pushed back to November 2, 2010. The first single from the album, "Hot-n-Fun" featuring Canadian recording artist Nelly Furtado, was released on May 18, 2010 on iTunes. It was released in the United Kingdom on August 30, 2010.  On August 20, 2010, a track titled "Party People" leaked onto the internet. It was rumored to be the second single from the album. On September 28, 2010, they premiered another track from the album titled "Hypnotize U" on Late Show with David Letterman, produced by electronic music duo Daft Punk. On September 30, 2010, in an interview with Mark Hoppus on A Different Spin with Mark Hoppus, Pharrell explained the album cover as "a mix of so many things. The feathers represent the peace, and the helmet represents the war. It's like where we are right now. There's a lot of war, that people can't necessarily explain. The economy sucks, girls are still beautiful. We wanted to make music that reflected that. So people can look back twenty years from now, and say 'this is what was going on'". They then announced in the interview that the next two singles would be "I've Seen the Light" and "Hypnotize U". Pharrell described "Hypnotize U" as being "so different from the rest of the album", stating he was "very pleased because it serves a different purpose" in the album.  On October 17, 2010, the standard edition and the deluxe edition of the album became available for pre-order on iTunes. It was later announced that they would support Gorillaz on the North American leg of their 2010 'Escape to Plastic Beach' world tour. In 2013, Pharrell confirmed a N.E.R.D album was in progress, but also mentioned that the album would not be released that year due to the projects he was working on with other artists. He has also said the album will be "nature-based". The group reunited on December 26, 2014, to release the songs "Squeeze Me," "Patrick Star," and "Sandy Squirrel" for the film The SpongeBob Movie: Sponge Out of Water.  N.E.R.D's fifth album, No One Ever Really Dies, was released on December 15, 2017 through i am OTHER and Columbia Records. It features guest appearances from Andre 3000, M.I.A., Gucci Mane, Wale, and Ed Sheeran among others. It was preceded by three singles; "Lemon" with Rihanna (on November 1), "1000" with Future (on November 29), and "Don't Don't Do It!" with Kendrick Lamar (on December 13).

Did they make any TV or radio appearances?
Late Show with David Letterman,