How can footsteps be muffled when filming takes place?

When filming, filming crews use special microphones that are meant to drown out the sounds of footsteps by focusing on other sounds like voices and shi

1. eadweard muybridge creates series photography - 1877

2. the kinetograph - 1889

3. philo farnsworth - 1929

4. kodak introduces kodachrome - 1935

5.   once upon a time in mexico was the first film to be shot digitally - 2003

i hope this ! : )