In the 1980s and 1990s, music was primarily distributed through physical formats like cassette tapes and CDs. With the advent of digital technology, music files began to be shared in various digital formats, including MP3 (MPEG Audio Layer 3) and MOBI (Mobipocket).

"Chandni" is a 1989 Indian Hindi-language romantic drama film directed by Mahesh Bhatt and produced by Mahesh Bhatt and Sita Mahesh Bhatt. The movie stars Sridevi, Vinod Khanna, and Rishi Kapoor in leading roles. The film tells the story of a young woman named Chandni (played by Sridevi) who falls in love with a man named Raja (played by Rishi Kapoor), but their relationship is complicated by Raja's past and his association with a woman named Shobhna (played by Pooja Bhatt).

MP3 is a compressed audio format that allows users to store and play back music files on digital devices. MOBI, on the other hand, is an e-book format that allows users to store and read digital books on their devices.

As for the MOBI format, you can find e-book versions of the movie's script or behind-the-scenes books on platforms like Amazon Kindle or Barnes & Noble Press.

"Chandni" is a classic Hindi movie from 1989 that features memorable music and performances. The soundtrack, composed by R.D. Burman, is still widely popular today, and the movie's story and characters remain iconic in Indian cinema. With the advancement of digital technology, the music and related content from "Chandni" are now easily accessible in various formats, including MP3 and MOBI.

The music from "Chandni" is still widely available today in various digital formats, including MP3 and MOBI. You can find the soundtrack on music streaming platforms like Gaana, JioSaavn, and Spotify, or purchase the MP3 files from online music stores like Amazon Music or Google Play Music.