What is Redux Saga? Redux Saga क्या है?

// Redux Saga - side effects management
import { call, put, takeEvery } from 'redux-saga/effects';

function* fetchUserSaga(action) {
  try {
    const user = yield call(fetchUser, action.payload);
    yield put({ type: 'FETCH_USER_SUCCESS', payload: user });
  } catch (error) {
    yield put({ type: 'FETCH_USER_ERROR', payload: error });
  }
}

function* rootSaga() {
  yield takeEvery('FETCH_USER_REQUEST', fetchUserSaga);
}