The concept of constitution and the Constitution have been historically and continue to be associated with a basic idea: "political power must be exercised according to statutory regulations and be subject to commitments or limitations". Gradually, the concept, significance, and functions of the Constitution have been enriched and evolved, and it has been treated as synonymous with constitutional democracy and identified with popular sovereignty, while in recent decades it is mainly perceived as a system of principles that governs the overall and fundamental regulation of social coexistence. In addition to being the fundamental law of the state, the Constitution also functions as a text that "ideally represents" the political organization of society and records the "collective political values" (freedoms, equality, justice, solidarity, democracy, rule of law, etc.) shared by its participants.

This book analyzes the concept of the Constitution, describes the procedures for its amendment and revision, and explains the guarantees of its observance and its functions in a concise, comprehensive, and clear manner. "What is Constitution" is necessary not only for legal scholars but for every citizen. The edition includes the full text of the current Constitution of 2001.