Husserl

"For Edmund Husserl, phenomenology is an approach to philosophy that takes the intuitive experience of phenomena (what presents itself to us in phenomenological reflexion) as its starting point and tries to extract from it the essential features of experiences and the essence of what we experience. This has been called a "transcendental phenomenology"... Husserl derived many important concepts that are central to phenomenology from the works and lectures of his teachers, the philosophers and psychologists Franz Brentano and Carl Stumpf. An important element of phenomenology that Husserl borrowed from Brentano was intentionality, the notion that the main characteristic of consciousness is that it is always intentional. Intentionality, which could be summarised as "aboutness" of thought, describes the basic structure of consciousness. Every mental phenomenon or psychological act is directed at an object — the intentional object. Every belief, desire, etc. has an object to which it refers: the believed, the desired. The property of being intentional, of having an intentional object, is the key feature which distinguishes mental/psychical phenomena from physical phenomena (objects), because physical phenomena lack intentionality altogether. Intentionality is the key concept by means of which phenomenological philosophy attempts to overcome the subject/object dichotomy prevalent in modern philosophy."

texto daqui.