title: What do dollar and colon represent in React?
body: <p>What do colon and dollar given below mean in React?<br/></p>
  
  <p><strong>Example for colon:<br/></strong>
  &#x3C;Route path={&#x27;/movie/:id&#x27;} component={Movie} /&#x3E;</p>
  
  <p><strong>Example for dollar, (its used right before the expression but why):<br/></strong>
  &#x3C;Link to={&#x60;/movie/${this.state.movies[index].id}&#x60;} key={index} className=&#x22;movieLink&#x22;&#x3E;</p>