Most condiments, like ketchup or mustard, last quite a while. And there's vinegar, that lasts years.
In most cases, we don't need to know how long a certain condiment lasts, because we use it well before it even starts to spoil. But if the bottle sits in storage for more than a few months already, you're right to have some doubts.
That's where the articles in this category come in. They explain the ins and outs of storage and shelf life of various condiments, so that you know if you should discard that old bottle or not.