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    Abruptly changing to another key can be considered 'Modulating' but the best "Modulation" is when the key change is not detected. If you are playing in the Key of C then you can modulate to the Key of G by at some point playing the F# instead of F, Or you can 'modulate' to the Key of F instead by playing the Bb instead of B....

    There are lots of songs that change keys for one verse and then go back to the original key, This is technically a 'modulation' but a smoother 'modulation' makes it difficult to notice that the key has changed. If you play a composition in the Key of C then you will find that it shares some basic chords with its neighboring key (G), The Key of C and the Key of G share the following basic chords:

C Major - A minor
------------
G Major - E minor

   The rhythmn part of the song could use those four basic chords and it would appear to be one 'Key', The 'soloist' could improvise using the 'G major scale' AND the 'C major scale' and the key changing would not be easily detected. Any two keys next to each other will share four chords, Any three keys next to each other will share two chords.

   The 'C major' and 'A minor' chord are in three keys (FCG), So the rhythmn part could play just those two chords while the solo part played the 'F major scale', 'C major scale' and the 'G major scale' and make it sound like one key if the 'modulation' is smooth...