Passing Chords with chord inversions

What are Passing Chords? are they Non harmonic tone chords?

it seems they like to use inversion chords as Passing chords

The Passing Five-four-three ( V 4/3) mostly found between I chord and (I six) chord

The Passing Five-Six-four ( V 6/4) mostly found between (I six) and the I chord

The "Cadential 6/4 chord

1.) The dissonant 4th interval

2.) I 6/4--V--I

3.) Fourth resolves down

The Pedal Six four chord

1.) a non-harmonic tone in the bass

2.) the bass note is held over and repeated to the next chord

3.) I-IV 6/4- I

The Passing Six four chord

1.) between a root positions chord and a first inversion chord

2.) I-V 6/4- I 6

Why are these 6/4 chord inversion so special?

Why did a composer use these inversions?

AFAIK they are special because in classicism they had good guys from marketing :P

They tended to overreact when they saw IV(the subdominant: a dominant placed at a fifth BELOW the I degree) and V (dominant placed on a fifth OVER the Ist), so when they discovered that when you play a tonic chord with a 5th in (the bassline) it doesn't sound like a tonic anymore, they started to use it everywhere.

It is basically the same history like with suspended chords in jazz, you just like to have some sort of lighter dominant, so you can play more with the phrase. Or something.

Yeonil