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What does "String" mean in context of counting theory ? For example :

There are 8 binary strings of length 3 .

What does binary and length signify here ?

Edit : I want to specifically why it is called a String ?

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    For variety. Like a string of beads. "Sequence" is common too, kinda boring. "Word" is freqently used also. All of these terms convey the notion that order is important.2012-08-04

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binary string means $\textit{a sequence of 0's and 1's}$ and the length defines the number of elements in the sequence.

Like $10011$ is a binary string of length $5$, $110011100$ is a binary string of length $9$ etc.