Is the OP referring to singing live or recording?

In a recording studio, a pop shield is standard equipment.

When singing live, pop singers tend to sing with their mouth virtually in contact with the mic. On stage, dynamic mics seem to be standard and though they are less susceptible to pops you still get them. To avoid them, position the mic a little below your mouth so you're singing over it and stand back a bit.

With people who like to sing in contact with the mic, the soundman will take steps to minimise pops at the desk - except in open mics where you have to remember to stand back!