What is rahe na rahe hum?

"Rahe na rahe hum" is a popular Hindi song from the Bollywood movie "Mamta" released in 1966. The song is composed by Roshan and penned by Majrooh Sultanpuri. It is sung by the legendary singer Lata Mangeshkar. The song is a melodious and soulful composition that describes the emotions of a lover who is separated from his/her beloved. The lyrics of the song talk about how memories and love will remain forever, even if the person is not physically present. The song has been considered as one of the most memorable tracks in Hindi cinema and has been covered and remixed by many artists.