Why does using nextLine skips the scanner and outputs the next output?

System.out.println( "Enter the name of the substitute yarn. ");

//String Input( Substitute name)
String newName = keyboard.nextLine();

//Enter Number of yards per ball ( New Name)
System.out.println( "Enter the number of yards per ball of " + newName);

When I run this the code skips the String newName = keyboard.nextLine(); code and skips to the next system output.

Please explain why.