One of the common practices applied to ensure secrecy in the modern day is through an information hiding technique known as steganography, which dates back to the ancient Greece. This study investigates digital steganography and its techniques that primarily focus on text steganography. At the same time, it also attempts to present a distinctive classification in dealing with steganography based on each technique. Three types of steganography classifications were discussed, that consist of the type of carrier file, natural key used, and the embedding techniques. Text steganography can then be further separated into three categories: format based methods, random and statistical generation, and linguistics method. Techniques belonging to each category were studied, and comparisons between each technique are introduced by highlighting the findings. This study also confirmed that there are three principal factors that need to be further explored and taken into account in the design of future steganographic systems, which are the capacity, high transparency, and security.