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This lecture鈥檚 objective is to provide students with a basic knowledge of the concept of space weather, how it is produced by our Sun, its most critical characteristics and how it can impact our infrastructure. The lecture gives an introduction to solar and heliospheric physics and presents eruptive events in the Sun producing the most severe space weather conditions. Interaction of the solar electromagnetic radiation and solar wind with the earth鈥檚 magnetosphere and atmosphere is described to provide a basic understanding of why space weather, for example, changes the radiation environment in space, impacts radio signal propagation in satellite navigation and produces the beautiful aurora. The final part of the lecture explains how we monitor space environment and space weather and how the data collected by space weather instruments is used to provide space weather services for the protection of our infrastructure.