Meaning of ‘sanskars’
The Vedic rituals performed since concept ion till death is called as Sanskars. The word ‘sanskar’ means to improve, to purify, and to remove shortcomings. 16 sanskars are performed.
Significance of Sanskars 
As per Vedic belief, there are 3 bodies viz. Physical body (which is cremated or buried after death), Psychic or subtle body (which is physical enough to interact with the physical body and non-physical enough to interact with the soul) and Causal body (which carries the seeds of Sanskars upon death when it goes with the soul).
The sanskars are offered to god to develop divine consciousness in the individual which help him to lead better life and to orient his sub-conscious mind for moksha. All sanskars are done through vedic mantras.
Description of Sanskars 
*when married couple decide to have child.