In an era marked by environmental consiousness and a growing imperative to mitigate the ecological impact of technology, "A Comprehensive Survey of Green Computing Practices and Technologies" stands as a beacon guiding the discourse on sustainable IT practices. As information technology continues to advance at an unprecedented pace, its carbon footprint and resource consumption have come under intense scrutiny. This survey paper endeavors to provide a thorough exploration of the multifaceted realm of green computing, offering a holistic view of the principles, practices, and technologies that collectively lead to a more eco-friendly and efficient IT ecosystem. The paper commences by elucidating the foundations of green computing, demystifying the concepts that underpin this emergent field. It delves into the environmental challenges posed by traditional computing, from energy consumption to electronic waste, setting the stage for a deeper exploration of sustainable solutions.