The literal translation of samsara would be “a wandering through." This refers to the way in which everyone passes through a number of lives and states.
The goal of nearly all religions that believe in samsara is to end its cycle of reincarnation by reaching nirvana, or moksha. This can be done by perceiving reality and the eternal Truth.
By understanding what samsara is, a yogi can use their meditation sessions to even greater effect. Focusing on samsara can not only help the practitioner keep the ultimate goal of liberation in mind, but it can also help them let go of current troubles and traumas as they remember that this life is just one of many, and everything is transient.