ABSTRACT Electroencephalography (EEG) is a widely used non-invasive technique for recording the electrical activity of the brain. EEG signals provide real-time insight into neural processes and have found significant applications in clinical diagnosis, cognitive neuroscience, and brain-computer interfaces (BCIs). This paper presents an overview of EEG signal acquisition, preprocessing techniques, and their applications in various domains, including medical diagnostics, cognitive state monitoring, and neurofeedback systems. The study explores different EEG signal processing methods, including filtering, artifact removal, feature extraction, and classif...