The usage and marketing of stationery is a niche industry that is increasingly threatened by electronic media. As stationery is intrinsically linked to paper and the process of written, personalized communication, many techniques of stationery manufacture are employed, of varying desirability and expense. The most familiar of these techniques are letterpress printing, embossing, engraving, and thermographic printing (often confused with thermography). Flat printing and offset printing are regularly used, particularly for low cost or informal needs.