What does each stock status mean?

What does each stock status mean?

Timely shipping is the number one priority for us. Here is what stock status means: 

Add to Cart
The product is in stock. Please add it to your cart and check out in time. Note that items in your cart are not reserved.
Out of Stock 
The product is out of stock. Please sign up with your email to get notified when it’s back in stock.
Pre-order /Backorder
The product is out of stock but available for pre-order/backordered. The estimated restocking date is shown on the product page. Your order will be shipped once the product is available.
Made After Ordering
The product is made-to-order (not kept in stock). Please contact us to place an order based on the MOQ (Minimum Order Quantity) shown on the page.
Discontinued
The product is no longer available for sale.