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Like
We have
7 chakras there is a mention of 7 lok in our scripts. You must have heard of VIBGYOR.
SO now
7 CHAKRA'S
7 LOKS
7 COLOURS
Each Chakra has seed syllable
It's colour
And hence Energy and Frequency

7 लोक are named as
भू ( भौतिक जगत)
भुवः ( शूष्म लोक)
स्व: ( दिव्य लोक)
मह: ( संतो और सिद्धों)
जन: ( ऋषि मुनि)
तप:
सत्यम

भू लोक means our physical plane
One which is bounded in this physical dimensions or 3 planes of existence

भुवः
Same as भू लोक
With one great difference that in this the living entities Do Not have PHYSICAL BODIES ( अशरीरी)

We live in this Physical plane or first one ( भू) लोक
After death one goes in भूवः लोक
Or सुष्म जगत

Now first understand that what is लोक
By Google search a region/ sansar
But what scientifically
It is Nothing less than DIFFERENT PLANES OF CONSIOUSNESS

All 7 are different planes of Consiousness
Which fall under 3 categories of World
Namely ( GROSS -- SUBTLE-- MIND)
Gross → Physical world →Human BODY
Subtle → 3-4 planes → सुष्म शरीर
Mental world → 5-6 planes
Above 3 world's is
GOD
One with realisation of 7th plane
One who's 7th chakra is open
One who is consious of Self

This same is mentioned in Geeta too
That
We have 3 bodies or शरीर

Now see we have ..else accurately..
We are that eternal
हम जीवात्मा है
We are that part of the ENERGY running this Universe.
Every Jeevatma has a objective
Like हमारा लक्ष्य होता to achieve a target in life
Similarly the Objective of जीवात्मा is to
EXPERIENCE that SELF.
वह हर क्षण विस्तार प्राप्त...