A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).
The first known practical telescopes were invented in the Netherlands at the beginning of the 17th century, using glass lenses. They found use in terrestrial applications and astronomy.
Within a few decades, the reflecting telescope was invented, which used mirrors. In the 20th century many new types of telescopes were invented, including radio telescopes in the 1930s and infrared telescopes in the 1960s. The word telescope now refers to a wide range of instruments detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.
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Activities such as astronomy, nature studies and viewing sports must often be done from a distance.
For various reasons we cannot get close enough to the subjects to view them in detail by our naked eyes alone. We must use optical devices such as telescope & binocular to increase our visual range.
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Selecting a telescope for both astronomy and land viewing sounds attractive, but these applications can work against each other, and your choice will usually be a compromise.
However, once you have decided on the telescope's main purpose, choosing telescopes can become much easier.