It depends. If the note is not sharped or flatted due to the key signature or an accidental earlier in the measure, it is a flat. If the note is sharped, the natural sign indicates that you play it a semitone lower.
flat
From e natural to f natural is a semitone. To make this a tone, raise the f to f sharp, or alternatively lower the e to e flat.
The symbol to lower a note a half step is called a flat.
if you are playing a brass instrument you tighten or loosen your ambocure (lips) to come out with a higher or lower note a sharp
The white notes E -> F and B -> C are a semitone apart. They do not require accidentals when present in any key in which those particular notes are not altered in the key signature, but do require accidentals if the corresponding notes in the key signature automatically raise or lower them by a semitone accordingly.
flat
From e natural to f natural is a semitone. To make this a tone, raise the f to f sharp, or alternatively lower the e to e flat.
Lower each note by a semitone.
Sharps make the note a semitone higher in pitch whereas flats make it a semitone lower. Hope this helps!
G# is one semitone lower than A.
A bemol is another term for the flat sign in music, ♭, used to lower a note by a semitone.
To lower a note that's already flat, there is such a thing as a double-flat.
The symbol to lower a note a half step is called a flat.
A flat (♭) lowers the pitch of a note by a semitone (half-step). A sharp (#) raises the pitch of a note by a semitone. Naturals cancel out sharps or flats that apply to notes and make them their usual pitch (♮).
if you are playing a brass instrument you tighten or loosen your ambocure (lips) to come out with a higher or lower note a sharp
acidentals are sharps or flats that either raise the note up one semitone, or lower it by one semitone. there can also be naturals, wich make the note natural again, so instead of F sharp, if you put the natural sign in, the note would just be F
The white notes E -> F and B -> C are a semitone apart. They do not require accidentals when present in any key in which those particular notes are not altered in the key signature, but do require accidentals if the corresponding notes in the key signature automatically raise or lower them by a semitone accordingly.