Feuds are extended rivalries between wrestlers. In EWR there are two types of feud; singles or tag team. 

Why do feuds? A feud has its own separate heat value, which is an indication of how the crowd are responding to it. If a feud is hot, it can add extra points to the crowd rating of a match, and therefore make a match more special. This means that wrestlers are capable of putting on better matches. If a feud is well booked, it can also help everyone involved become more over.

So what are the drawbacks? Just as a good feud can help the heat of a match, a bad feud can take heat away. Also, if you book a feud badly, you can actually do more damage than good to a workers heat. Finally, there are only 8 feud slots available, so they must be managed correctly. These are divided into two sections - 3 Main Feuds and 5 Minor Feuds. The difference is that your main feuds are promoted all the time, as so if the feud is not continued in some fashion on your large, end-of-the-month show, it will lose heat. Minor feuds will not lose heat if they are not continued on the large shows, but conversely, when the feud ends, the gains for the wrestlers involved are much smaller than with major feuds.

What makes a good feud? If you break a real-life feud down its most basic level, there are only a finite amount of different types: monster heel vs plucky underdog face, evenly matched enemies, cheating heel who always managed to avoid the righteous face until getting what he deserves in a big revenge match...these are just some of them. EWR is programmed to know what makes a good feud. So, if you were to book the babyface Edge to cheat his way to several victories over heel Kurt Angle before winning the final feud-ending match  by DQ, neither man is likely to benefit. Having heel Angle cheat his way to a few wins, interfere in Edges matches, and generally make his life miserable before falling to a clean victory in a cage match on pay-per-view however is a good feud. Also, EWR knows that a feud is a long term series of matches; if you book a feud that ends after a handful of interviews and a single match, the fans are going to be disappointed and are going to turn on you and the workers involved. You can see the tally of advantages in a feud by clicking the feud statistics button in the Feuds section. Please note that some events do not count toward these totals, in particular draws (as neither person took an advantage), and also some situations in multi-person matches (such as a four way match where one worker defeats a feuding worker in the first fall).

How do you end a feud? There are only two ways to end a feud; on-screen or off-screen. You can end a feud off-screen from the Feud section. This means you end it without any explanation to the fans. You would do this if you desperately need a free feud slot, or if you feel a feud is going so badly that you may as well just quit while youre ahead. You can only end a feud on-screen by having a final feud blow off match; this must be either a singles match (for a singles feud) or a tag match (for a tag feud) and MUST end with a decisive winner. When booking, assuming you have not ended it by a draw, you will find that one of the Purpose options is End Feud. You must select this to end the feud. Once the feud is ended, EWR will work out how well the feud went, etc, and will alter the wrestlers statistics accordingly. It will also free up the feud slot for you.

When would you use feuds? Feuds are best for either making everyone involved more popular, or if you wish to use one wrestler as a sacrifice to make another look better. It is usually not a good idea to use feuds unless you have at least one weekly TV show, as otherwise you will not be able to build them up adequately. It should also be noted that, due to the nature of feuds, it is unwise to use managers in them. This is because the feud can only end on-screen with a match, and generally managers arent trained to produce excellent matches.

As a side note, a feud automatically gets ended off-screen if one of the feuding wrestlers leaves the promotion. However, if someone becomes injured, the feud is not ended: it becomes your decision whether to end the feud or wait for the wrestlers return.