Objective: The objective of this study is to investigate the fundamental nature of the right to evidence in the Brazilian legal system, aiming to analyze its importance for guaranteeing due process and the realization of justice. Theoretical Framework: This section presents the main concepts and theories that underpin the research. Key theories include the principle of adversarial proceedings, the principle of ample defense, and due process of law, providing a solid foundation for understanding the context of the investigation. Method: The methodology adopted for this research comprises a qualitative approach, with documentary analysis and case studies of landmark decisions in Brazilian law. Data collection was conducted through a literature review and jurisprudence analysis, focusing on higher court decisions addressing the right to evidence. Results and Discussion: The results revealed the crucial importance of the right to evidence for maintaining the balance between parties in judicial proceedings. In the discussion section, these results are contextualized in light of the theoretical framework, highlighting implications for legal practice and the protection of fundamental rights. Possible discrepancies and limitations of the study are also considered in this section. Research Implications: The practical and theoretical implications of this research are discussed, providing insights on how the results can be applied or influence practices in the field of civil and criminal procedural law. These implications may include the reformulation of judicial procedures and the training of legal professionals. Originality/Value: This study contributes to the literature by exploring the fundamental nature of the right to evidence in Brazil in a thorough and systematic manner, highlighting new findings and offering a critical analysis of judicial practices. The relevance and value of this research are evidenced by its potential to influence procedural reforms and improve the effectiveness of the judicial system.