The ability to recognize emotional states, such as happiness, from electroencephalography (EEG) signals has gained significant attention in recent years due to its potential applications in affective computing, mental health monitoring, and human-computer interaction. This paper presents a comprehensive overview of EEG-based recognition of happiness, including signal acquisition, preprocessing techniques, feature extraction methods, classification algorithms, challenges, and real-world applications. Additionally, it discusses the future directions and potential impact of EEG-based happiness recognition.