What does Backquote (`) mean in my expression?

Question

When producing data,

data = Table[{n/100, (2 n)/100 + 1 + 0.1` RandomReal[{-1, 1}]}, {n, 0,
100}];

What does the ` mean here? Does it simply mean multiplication? Because if I delete it, the code seems to do the same work.

Answer 1

It means 0.1 is a machine precision floating point number. What you show is equivalent to

.1 // FullForm

0.1`

Note: What you show is equivalent to

data = 
  Table[{n/100, (2 n)/100 + 1 + RandomReal[{-.1, .1}]}, {n, 0, 100}];