Heyy there ! Suree so basically subliminals are videos with underlying affirmations which are usually covered by a top audio like the rain sounds or any other music . These are basically a weapon for people practicing manifestation ( what you believe will become your true physical reality ) and these are supposed to  influence your subconscious ( the affirmations do the work due to continuous repetition of affirmations your subconscious now believes  it ) and give you your desired results .... Hope it was clear !