# So, what is a logarithm?

If you type the definition of logarithm in Google, it spits out something unhelpful, like:

a quantity representing the power to which a fixed number (the base) must be raised to produce a given number.

Don't blame yourself if you struggle with remembering it.

The fact is, nobody in Computer Science things of algorithm like that.

So, how do they think about it?

Well, as a tree height...

Let me explain.

## Practical use of binary search

If you think your knowledge of logarithmic algorithms is useless, think again.