The short answer is, yes!
Toners are known as the prep step in your routine, are applied after cleansing and exfoliating and before essence and serums and can help with a number of things. First, if applied with a cotton pad, they can help remove any impurities like dirt and make up leftover from your cleansing steps. It can be surprising how much grime accumulates on your face by the end of the day!
Second, they balance of the skins pH and moisture levels which can be thrown off-kilter after cleansing and exfoliating. Third, the prime your skin to more effectively absorb any serum and moisturiser you apply afterwards.
And finally, they often contain skin improving ingredients that can supplement your treatment and protection products.