Cleansing is the first step of your skincare routine (and personally, I consider it the most important). Cleansing prevents clogged pores and maintains pore size, prevents pollution from laying on the skin causing premature ageing. Cleansing allows the following products you apply to be absorbed into the skin, it encourages proper skin hydration and prevents the production of excess oils which can lead to congestion and breakouts.
In short, daily cleansing (and double cleansing at night!) is essential to keeping your skin looking radiant and healthy.
Make sure you always have your cleanser prescribed for you and your own personal skin concerns.