I am not sure this is what you are asking about but…
Phenomenology is a philosophical movement usually traced back to Edmund Husserl (d.1938 I think)…though the term itself goes back further and has a significant place in Kant and esp. Hegel (Phenomenology of Spirit). Literally it means the study of appearances.
In Husserl it represents a way to place aside all presuppositions and allow things to present themselves to the knower. By doing this, one can discover the universal and necessary structures present in all experiences, or the universal laws that govern certain regions of human experience. Husserl very much wanted to reestablish philosophy as a science capable of providing rigorous description and certain knowledge. Since we are on a Catholic forum, I will also point out a couple Catholic followers who were influenced by Husserl’s earliest work: Edith Stein is probably the most famous, but one should also mention Robert Sokolowski.
In the generations that followed Husserl’s influence was great, but phenomenology did not really remain what he envisioned it to be. Heidegger, who worked with Husserl, led phenomenology in a new direction. First of all he questioned Husserl’s commitment to an objective starting point, and the theoretical attitude that accompanied a belief in such a starting point. Second he thought the goal of philosophy was to raise the question of Being, which was particularly challenging since Being never appears, is never a phenomenon as such. Returning to Catholic thinkers, one can see the influence of Heidgger in very striking ways in the liturgical theologian Chauvet.
Pheonomenology has taken a further, post-Heideggerian, twist with the arrival of French thinkers like Levinas, Derrida, and the Catholic philosopher/theologian Jean-Luc Marion. Marion attempts to push beyond Heidegger’s question of Being, by calling attention to the fundamental experience of Givenness (where one hears overtones of Christian themes of revelation and creation).
salaam.