How do I use the voice recognition?

How does the voice recognizer work?

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Welcome. This is how it works.

An example demonstration might help.

Here are two examples

and the SpeechRecognizer documentation SpeechRecognizer

.Get text to Tamil [which code is used]?

You asked the opposite (text to speech) here

My understanding is TextToSpeech and SpeechRecognizer cannot use App Inventor controls to use Tamil.

There are alternatives:

SpeechRecognizer Android Tamil - Google Search