This paper reviews various techniques in digital steganography, focusing on spatial and transform domains, and categorizes them into image-based, video-based, and audio-based mediums. The primary technique identified in the spatial domain is Least Significant Bit (LSB), while in the transform domain, methods like Discrete Wavelet Transform (DWT) and Discrete Cosine Transform (DCT) are emphasized for their robustness and performance. Future research aims to explore feature-based text steganography.