Advantages in using two strings?

So I see around here that a lot of people use 2 strings when getting there rackets strung. Is there a big difference when using 2? Are there any pros and cons?
 

Kevo

Legend
The advantages are normally to soften a stiff string or to save money. A lot of people hybrid poly with a softer string, and a lot of people will hybrid gut with something cheaper to save some money. There are some other reasons to use a hybrid as well, but I would guess those are the most common.
 

@ce

Rookie
The main advantage is the ability to combine a durable string in the mains with a softer string in the crosses.
 
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