Vedic Rituals and Routines!!! Why do wear marks (tilak, and the like) on the forehead?

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The tilak invokes a feeling of sanctity in the wearer and the others. It is recognized as a religious mark. Its form and colour vary according to one's caste, religious sect or the form of te Lord worshipped.

In earlier times, the four castes (based on varna or colour) - Brahmana, Kshatriya, Vaishya and Sudra - applied marks differently. The brahmin applied a white chandan mark signifying purity, as his profession was of a priestly or academic nature. The kshatriya applied a red kumkum mark signifying valour as he belonged to warrior races. The vaishya wore a yellow kesar or turmeric mark signifying prosperity as he was a businessman or trader devoted to creation of wealth. The sudra applied a black bhasma or kasturi mark signifying service as he supported the work of other three divisions.

Vedic Rituals and Routines!!! Why do we prostrate before parents and elders?

Indians prostrate before their parents, elders, teachers and noble souls, by touching their feet. The elders in turn bless us by placing their hand on or over our heads. Prostration is done daily, when we meet elders and particularly on important occasions like the beginning of a new task, birthdays, festivals, etc. In certain traditional circles, prostration is accompanied by 'abhivaadana', which serves to introduce oneself, announce one's family and lineage.

Vedic Rituals and Routines !!! Why do we do Namaste (Salutation)?

Indians greet each other with namaste. The two palms are placed together in front of the chest and the head bows whilst saying the word namaste. This greeting is for all ----- people younger than us, of our own age, those older, even strangers.

There are five forms of formal traditional greetings in the Sastras, of which 'namaskar' is one. This is understood as prostration, but it actually refers to paying homage as we do today when we greet each other with a namaste.