Answer

In Jainism, lok means the part of space that contains the universe where living beings, matter, time, motion, and rest exist. It is the occupied cosmos.

Explanation

According to Jain cosmology:

• The lok is the whole world-region where existence is possible.
• It includes:

- Urdhva Loka — the upper world - Madhya Loka — the middle world - Adho Loka — the lower world

• Beyond the lok is aloka, which is empty space and has no soul, matter, or activity.

So, in simple words, lok is the entire universe as understood in Jain philosophy, but only the portion filled with existence.

Spiritual Understanding

In Jain Dharma, understanding the lok helps us realize:

• The universe is vast and orderly.
• The soul travels through different realms according to karma.
• Liberation means going beyond the cycle within lok.
• The goal of spiritual practice is to मुक्त the soul from worldly bondage and reach siddha state, beyond rebirth.

Takeaway

Lok in Jainism is the inhabited universe — the complete cosmic space where souls and matter exist. Beyond it lies alok, the space without existence.