What is the function of a cadence in western music and what are the different types?

The function of the musical cadence in western music is to either create tension at the end of a musical phrase to lead into another segment of music, or to definitively conclude a musical phrase. This is conveyed via the use of harmony and chord progressions, as certain chords naturally gravitate to each other, i.e. chord 'V' to chord 'I' (upper case numerals denote major chords, lower case numerals denote minor chords). This type of progression is the strongest of them all and is referred to as a perfect cadence, and is the foundation of many western musical traditions including classical music, jazz and pop. In C major this would be a G major or G7 resolving to C major. Other cadences include the plagal cadence which is chord 'IV' resolving to chord 'I', which is commonly found in choral music and is also referred to as the 'amen' cadence for this reason; this is a resolution but not as strong as the perfect cadence. In C major this would be an F major resolving to C major. The imperfect cadence is where a chord will move to chord 'V' and then does not resolve, leaving the suspense on chord V to be resolved in the following musical phrase. In C major this would be any chord, let's say D minor (chord ii) resolving to G7 or G major. The final of the most common cadences is the interrupted cadence, where chord 'V' resolves to chord 'vi' ; this is often unexpected when incorporated into a musical phrase and is a step to what is known as the relative minor. In C major this would be a G major or G7 resolving to an A minor chord.