Dark matter is the dominant component of matter in the Universe at present but whether it interacts with forces other than gravity – as in gravitational lensing -- is unknown. History of dark matter has not even reached one century, but it is expected that the identity of dark matter will be unraveled in a near future thanks to modern science and technology.
In this colloquium, we introduce how to understand the nature of dark matter from particle physics point of view in both theory and experiment, and discuss the issues and tasks in directly proving the presence of dark matter in the future.