A common use - would be to use one printer with four computers. Each computer has a data cable leading to the 4-way switch - and the switch has one data cable leading to the printer. Each user turns the switch to the relevant position in order to use the printer.
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One way to use four fours to make 25 is 4 + 4 + 4 + √4, which equals 25.
If you are allowd to use .4 and factorial, the answer will be 4! - (.4 - 4!) / .4
If you're allowed to use any symbols, then 4 + 4 + 4 + sqrt(4) will do it.
1 way to spell - FOUR
Four four-legged turtles can not outrun faster four legged creatures like rabbits even if they could run four times faster.