Transistor is the Component which is based on the Semiconductor.
And which does the actual control of current flow within electronic devices.
Previously it was Vacuum tubes which was used for same purpose.
But is was not pragmatic solution due to huge size and overheating.
Now There is no electronic device without transistors.
It all started noticeably with Radio .Sony mass produced Radio by replacing Vacuum Tubes with Transistors.
Thats why infact Radios were earlier referred simply as Transistors.
In computers,They are used for storing bits (binary digit 0 and 1) .
Since transistor control the current flow,
When there is No current Flow-->Store 0 digit
When there is Current Flow-->Store 1 digit
When there are more & more transistors , this will increase the computation power/parallel processing.
Hence now billions of transistors within a single computer.(ofcourse within Integrated Circuits)
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