Edmund Husserl is widely regarded as the founder of phenomenology. He developed the phenomenological method as a way to study consciousness and the relationship between consciousness and the world.

Phenomenology primarily relies on introspection as its method of investigation. Through introspection, phenomenologists seek to describe and analyze the contents of consciousness as they are experienced.

Intentionality is a key concept in phenomenology. It refers to the inherent directedness of consciousness towards objects or meanings. Consciousness is always about something, and this aboutness is what is meant by intentionality.

Phenomenology emphasizes the importance of sense experience as the primary source of knowledge. Knowledge is derived from our direct experience of the world through our senses.

Epoché is a fundamental concept in phenomenology. It refers to the process of bracketing or suspending our assumptions and beliefs about the world in order to focus on the phenomena themselves.

Phenomenon is a central concept in phenomenology. It refers to the way in which objects appear to us in consciousness. Phenomena are the objects of our experience, and they are studied through the method of phenomenological description.

Noesis is a key concept in phenomenology. It refers to the subjective act of consciousness, the intentional act by which we apprehend objects. Noesis is the subjective correlate of the phenomenon.

Phenomenology emphasizes the mutual constitution of consciousness and the world. Consciousness is not separate from the world, but rather is constituted by its intentional relationship with the world.

Lifeworld is a key concept in phenomenology. It refers to the world of everyday experience, the world as we encounter it in our daily lives. The lifeworld is shaped by our past experiences, cultural background, and social interactions.

Temporality is a fundamental concept in phenomenology. It refers to the way in which we experience time as a flowing, dynamic process. Time is not a static container, but rather a lived experience that is constantly changing.

Affectivity is a key concept in phenomenology. It refers to the way in which our emotions and moods shape our experience of the world. Affectivity is not simply a subjective state, but rather a way of being in the world.

Corporeality is a key concept in phenomenology. It refers to the way in which our bodies shape our experience of the world. Our bodies are not simply objects in the world, but rather are the means through which we experience the world.

Intersubjectivity is a key concept in phenomenology. It refers to the way in which we experience other people as conscious beings. Intersubjectivity is not simply a matter of communication or social interaction, but rather a fundamental aspect of our being-in-the-world.

Meaningfulness is a key concept in phenomenology. It refers to the way in which we experience the world as meaningful. Meaningfulness is not something that is added to the world from outside, but rather is an inherent aspect of our experience.

Unity of consciousness is a key concept in phenomenology. It refers to the way in which we experience the world as a unified whole. Our consciousness is not a collection of separate parts, but rather a unified field of experience.