der Vormittag
morning
The time of day between early morning and noon, roughly from 9 a.m. to 12 p.m.
Ich habe am Vormittag einen wichtigen Termin beim Zahnarzt.
I have an important dentist appointment in the morning.

morning
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morning
The time of day between early morning and noon, roughly from 9 a.m. to 12 p.m.
Ich habe am Vormittag einen wichtigen Termin beim Zahnarzt.
I have an important dentist appointment in the morning.

The word is structured very logically: it consists of 'vor' (before) and 'Mittag' (noon). So it simply describes the time before noon.
Lass uns die Besprechung auf den Vormittag legen.
Let's schedule the meeting for the morning.
To indicate a point in time, you use 'am Vormittag' (in the morning). To describe a regular action, you use the adverb 'vormittags' (in the mornings), written with a lowercase letter.
Ich gehe am Vormittag einkaufen.
I go shopping in the morning.
'Vormittag' (morning) is often combined with adverbs such as 'heute' (today), 'gestern' (yesterday), or 'morgen' (tomorrow) to specify the time more precisely.
Morgen Vormittag habe ich leider keine Zeit.
Unfortunately, I don't have time tomorrow morning.
tomorrow / morning
'morgen' and 'der Vormittag' can both have to do with the time before noon, but they work differently. 'morgen' is an adverb and often means the next day. In expressions like 'morgen Vormittag' (tomorrow morning / tomorrow before noon), it says on which day something happens. 'der Vormittag' is a noun and refers to the time of day roughly between 9 a.m. and noon. Learners may confuse them because 'Morgen' can also be a time of day. A practical rule is: use 'morgen' for the next day; use 'der Vormittag' for the time of day before noon.

Am Vormittag ruft die Ärztin zurück.
The doctor will call back in the morning.
Morgen habe ich vor dem Termin noch Zeit.
Tomorrow I still have time before the appointment.