Based on the search results, "mp3 download" refers to the act of downloading an audio file in the MP3 format. In this case, the search results show that "What If I Say" is a song by Fireboy DML, a Nigerian artist. The search results provide links to websites where the song can be downloaded in MP3 format, such as TrendyBeatz, JustNaija, TunezJam, and citiMuzik. The song is also available on YouTube, where it can be streamed and watched in the form of an official music video.