Using puts automatically appends a newline character \n to the output; the related print method does not:

Single-quoted Strings

All the examples so far have used double-quoted strings, but Ruby also supports single-quoted strings. For many uses, the two types of strings are effectively identical: 

There’s an important difference, though; Ruby won’t interpolateinto single-quoted strings: 

Note how the console returns values using double-quoted strings, which requires a backslash to escape special characters such as #.

           If double-quoted strings can do everything that single-quoted strings can do, and interpolate to boot, what’s the point of single-quoted strings? They are often useful because they are truly literal and contain exactly the characters you type. For example, the ‘‘backslash’’ character is special on most systems, as in the literal newline \n. If you want a variable to contain a literal backslash, single quotes make it easier:  

  As with the # character in our previousexample, Ruby needs to escapethe backslash with an additional backslash; inside double-quoted strings, a literal backslash is represented with two backslashes. For a small example like this, there’s not much savings, but if there are lots of things to escape it can be a real help: