Sanskaar

There are three meanings of Sanskaar in Hindu Religion. 

(A) There are 16 Sanskaar or say religious ritess of a person since his birth till death at time to time, such as:
(1) Conception (Garbhaadhaan) Sanskaar - as soon as the conception is known 
(2) Punsavan (Milk) Sankaar - performed in 3rd month
(3) Vedic Rites (Seemantnayan - performed in 6th month)
(4) Janm or Jaat Karm Sanskaar - at the time of birth
(5) Naamkarn Sanskaar (Nishkraman) - after some time of birth - child is shown to Soorya. He is given a name 
(6) Annpraashan Sanskaar - When a child is given cooked grains for the first time
(7) Mundan Sanskaar - in this all first hair (hair of birth) of head of the child are shaved
(8) Upnayan Sanskaar - in which Yagyopaveet or Sacred Thread is given to child and he is sent to Guru to get educated. This is called the Second Birth also. This is not for Shoodra.
(9) Study of Ved - sometimes the 8th and 9th Sanskaar are done together and sometimes at some interval. It is more important for Braahman
(10) Vivaah Sanskaar - marriage ceremony
(16) Daah Sanskaar - last rites

Among them some Sanskaar are certain and are always performed - (1) Janm Sanskaar, (2) Naamkarn Sanskaar, (3) Annpraashan Sanskaar, (4) Mundan Sanskaar, (5) Upnayan Sanskaar, (6) Vivaah Sanskaar, and (7) Daah Sanskaar

(B) Whatever actions we have done in our previous lives, they form our future and nature. This nature resulted from such actions is called Sanskaar. When a person behaves in a certain way without teaching it, then it is said that "his Sanskaar are like that". 

(C) Whatever basic habits are formed in very childhood are also called Sanskaar in later years, e.g. "If parents keep the foundation of good Sanskaar in a child, he will become a good man in later years." For example if Parents makes a habit to do daily chores (a set of daily routine) in early morning time, say at 5.00 am, and if it continues till death, that is called Sanskaar. Such habits die hard, sometimes do not die at all.