What is the difference between distillation,distillation under reduced pressure,and steam distillation?

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DistillationDistillation under reduced pressureSteam distillation
$i$. Used to separate two liquids having a sufficient difference (more than $30^{\circ}C$) in their boiling points and to purify impure liquids.$i$. Used to purify liquids having very high boiling points that decompose at or below their boiling points by lowering the pressure.$i$. Applied to substances that are steam volatile and immiscible with water.
$ii$. Purified liquid is obtained directly.$ii$. Pure liquid is obtained after the process.$ii$. $A$ mixture of water and the liquid is obtained,which is then separated using a separatory funnel.
$iii$. Pressure in the flask does not need to be decreased.$iii$. Pressure in the flask must be decreased.$iii$. Steam is passed through the mixture.

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