This document provides an overview of small and medium-sized enterprises (SMEs) and their use of information technology. It discusses the history and rise of SMEs, noting they were largely ignored until the 1970s but are now recognized as playing an important role in economies. The document also covers definitional problems in classifying SMEs due to heterogeneity in factors like organization size, industry, and ownership structure. Research findings show that while SMEs face disadvantages accessing new technologies compared to large enterprises, they contribute significantly to job growth, innovation, and economic sustainability.