Making a shared block with data

[eluser]Unknown[/eluser]
I’m kind of new to this framework.

Can I know how do I make a proper shared block that contains pulled data from the database?

For example a “Featured product block” where I can located in different pages?

Product Controller

Code:

public function featured_product_block(){
  $product_array = $this->product_model->get_product();
  $data["products"] = $product_array;
  $this->load->view("blocks/product_block", $data);
}

So do I just call this controller from another controller? Or is there another way to do it?