Philosophy is the discipline that studies major and universal questions, including existence, knowledge, values, reason, and language. It encompasses a vast number of topics and problems, from ethics and political figures to metaphysics and logic. Here are principal aspects of philosophy:

1. Definition of Philosophy
Philosophy comes from the Greek words "philos" (love) and "sophia" (wisdom). It is zeal to realize and make sense of the world around us and our place in it.

2. The Main branches of philosophy
- Ontology research of the essence of being and existence.
- Epistemology the study of the nature and limits of knowledge.
- Ethics the analysis of moral principles and concepts of good deed and evil.
- Logic research of the forms and principles of correct thinking.
- Socio-political philosophy the study of questions of power, justice and the state.

3. Famous Philosophers
During the history of philosophy, many thinkers have made significant contributions to this science. Some of the most famous include:
- Socrates, considered the progenitor of Western philosophy.
- Plato, a student of Socrates, developed the doctrine of forms.
- Aristotle, the creator of logic and a large number of scientific fields.
- Immanuel Kant, known for his Philosophy critical philosophy and work on moral issues.

4. The Relevance of Philosophy in the Modern World
Philosophy remains urgent in the modern world since it helps people to understand complex social and moral issues, also develops critical thinking. It affects the legal system, politicians, and different fields of science.

5. Practical Applications of Philosophy

Philosophical ideas penetrate everyday life. Ethical reflection helps people do the correct thing in difficult situations, and philosophical analysis contributes to best understanding of issues related to technology, art, and social justice.

Philosophy is not only an academic discipline, but also method of thinking assists us to understand life's complexities and make informed choices.