The soul is the source of each unique human being.
Your soul is the living, feeling, emotional, passionate heart of you!
Your soul is the infinite aspect of your individuality (that lives on beyond the physical body).
Each soul is a unique combination of characteristics, attributes, and qualities, including unique desires, feelings, aspirations, intentions, personality, instinct, energy, and free will.

With this definition, the soul contains both the personal uniqueness of each human being, plus it is connected to divine source (more than human) – sourcing all human souls in the universe.
This definition is not presenting something new…instead it combines concepts presented across religions, philosophies, spiritual traditions. However, different words for soul are used across various communities.
Five of the world’s major religions — Judaism, Christianity, Islam, Buddhism, and Hinduism — describe some version of a “self” which lives on after the physical body dies. But each imagines the origin, journey, and destination in different ways, and thus their narrative stories in books/bibles use different words emerging from various human languages over time.
For example, in my primary spiritual community Trillium Awakening, the word Being is used to refer to the aspect(s) of self that is both unique and divinely sourced.
The soul exists at three levels or dimensions simultaneously: physical, subtle, and causal.
Your physical material body and subtle etheric energy body are two vehicles through which the soul expresses itself on earth and in the universe, respectively. Your soul is the causal source dimension of your whole being and unique body.