The iconic romantic drama Iss Pyaar Ko Kya Naam Doon? is available to watch through several official digital platforms. While many episodes and clips are uploaded to YouTube, the primary official streaming home for the full series is Disney+ Hotstar (or JioHotstar in India). Official YouTube Playlists

1. Dailymotion – Search "IPKKND episode X" – lower quality but complete.
2. Hotstar (with VPN) – Use a VPN to India, then watch free with ads.
3. Voot (defunct) – Now merged into JioCinema, but some episodes may remain.

Note on Seasons: While Season 1 (Arnav and Khushi's story) has 398 episodes, the entire franchise spans three seasons with different casts and storylines.  Iss Pyaar Ko Kya Naam Doon - streaming online

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Beyond YouTube, the show is officially hosted on major streaming services:

: This is the primary official playlist from StarPlus featuring full episodes. StarPlus Classics - Full Series Playlist

: Contains over 600 videos, including full episodes up to the finale (Episode 398). Iss Pyaar Ko Kya Naam Doon - Romantic Clips

Most YouTube playlists labeled "All Episodes" often miss episodes 45-50 or 110-115. Cross-check with a Wikipedia episode list before committing to a 20-hour binge.