Jean-Paul Sartre, a French philosopher, is often considered the father of Existentialism. His influential works, such as 'Being and Nothingness', explore themes of freedom, responsibility, and the meaning of existence.

In Husserl's phenomenology, intentionality refers to the fundamental characteristic of consciousness to be directed towards objects. It is the intentional relationship between consciousness and the world.

Jacques Derrida, a French philosopher, is renowned for his concept of deconstruction. He argued that language and meaning are inherently unstable and subject to multiple interpretations.

Friedrich Nietzsche, a German philosopher, is known for his concept of the 'will to power' and his exploration of themes such as overcoming and eternal recurrence.

Martin Heidegger, a German philosopher, is known for his concept of 'being-in-the-world' and his existential analysis of human existence.

Hans-Georg Gadamer, a German philosopher, is known for his concept of 'hermeneutics' and his argument that the meaning of a text is created through the interaction between the reader and the text.

Michel Foucault, a French philosopher, is known for his concept of 'the gaze' and his exploration of power dynamics in society.

Emmanuel Levinas, a Lithuanian-French philosopher, is known for his concept of 'responsibility for the other' and the recognition of the other's face as the foundation of ethics.

Alain Badiou, a French philosopher, is known for his concept of 'the event' and his exploration of the relationship between language and being.

Albert Camus, a French philosopher, is known for his concept of 'nausea' and 'absurdity' and his argument that existence precedes essence.

Jacques Derrida, a French philosopher, is known for his concept of 'différance' and his exploration of the relationship between speech and writing.

Martin Heidegger, a German philosopher, is known for his concept of 'care' and his argument that being-in-the-world is a fundamental aspect of human existence.

Emmanuel Levinas, a Lithuanian-French philosopher, is known for his concept of 'the gift' and his exploration of the relationship between ethics and alterity.

Jean-Paul Sartre, a French philosopher, is known for his concept of 'bad faith' and his argument that authenticity requires confronting one's own existence.

Jacques Derrida, a French philosopher, is known for his concept of 'the trace' and his exploration of the relationship between presence and absence.