Is it necessary

This thread has been moved to Misc Topics from General Info.

A circle is though if recommended to be cast, but it isn't mandatory.
A circle is cast for purposes such as protection during spell casting. To contain any magickal energy raised and to prevent its dissipation until it has been used up is another purpose of a circle.
@Pooja: It is not that you need to cast a circle if you are working with fire, etc. It is completely a personal preferance and is up to the caster if he wishes to cast a circle or not.

I almost certainly cast a circle around my work with representation of the elements even if i am not in it as with ritual witg my god and godess every full moon.