Buongiorno a tutti.

Because buongiorno is a fixed greeting in Italian, written as one word.

It comes historically from buon + giorno, but in modern Italian the greeting is normally written as buongiorno.

Also, buon is the shortened form of buono used before many masculine singular nouns, so buon giorno would be the older/literal combination, but the greeting itself is standardly buongiorno.

Buono changes form depending on the noun that follows it. Before many masculine singular nouns, it becomes buon.

So:

• buono = basic dictionary form
• buon giorno = good day
• fixed greeting: buongiorno

This is similar to how some adjectives shorten in certain positions in Italian.

A tutti means to everyone or to all.

So the structure is basically:

• Buongiorno = good morning / good day / hello
• a tutti = to everyone

It is a very common way to greet a group, especially in class, meetings, presentations, videos, and public speaking.

Because Italian normally uses a with this kind of greeting when addressing a group in the sense of to everyone.

So:

• Buongiorno a tutti = Good morning, everyone

Using just tutti here would not sound natural as the standard greeting formula.

No. In standard Italian, tutti can refer to:

• a group of all men
• a mixed group of men and women
• everyone in general

So in Buongiorno a tutti, tutti is the normal default plural form for a general group.

If the group is entirely female, you could say Buongiorno a tutte.

It is generally neutral to polite. It works well in both formal and informal situations.

You can use it:

• with classmates
• in a meeting
• in a speech
• in a classroom
• at the start of a video
• with people you do not know well

It is more polite and less casual than Ciao a tutti.

It is used in the morning and often into the early afternoon, depending on region and context.

Very roughly:

• buongiorno: morning to around lunchtime / early afternoon
• buonasera: later afternoon or evening

In some places the switch happens earlier, in others later. The exact cutoff is not the same everywhere.

Yes. Even if the meaning has already been given to you, it is useful to know that buongiorno functions as a real greeting, not just a literal phrase.

So depending on context, it can feel like:

• good morning
• good day
• a polite hello

That is why it is so common in shops, offices, schools, and phone calls.

A helpful approximate pronunciation is:

bwon-JOR-no

A few key points:

• buon sounds roughly like bwon
• gior has a soft j sound, like the j in jam
• gn in Italian is a special sound, like ny in canyon

So the middle of the word is not a hard English g sound.

A rough English-friendly version is:

bwon-JOR-nyo

Not perfect, but close enough for a learner.

A rough guide is:

ah TOOT-tee

Notes:

• a is a simple open vowel, like ah
• tutti has a double t, so the t sound is held a little longer than in English
• stress falls on the first syllable of tutti

So try to make tutti sound crisp and clearly divided: TOOT-tee.

Yes. Buongiorno by itself is perfectly complete.

You add a tutti when you want to greet a group specifically.

Compare:

• Buongiorno. = Good morning / Hello.
• Buongiorno a tutti. = Good morning, everyone.

So the shorter version is common in one-to-one situations, while the longer version is especially useful for groups.

In everyday Italian, it is very common to write it simply as:

Buongiorno a tutti.

You may also see:

Buongiorno a tutti!

A comma is not usually needed in this exact phrase, because a tutti is part of the greeting formula.

In English, Good morning, everyone usually takes a comma, but Italian punctuation does not always match English punctuation in the same way.

Yes, very often.

It is a very natural opening in:

• emails to a group
• classroom talks
• presentations
• YouTube videos
• meetings
• public announcements

It sounds friendly, clear, and polite. That is one reason learners hear it so often.

Usually, yes, in many everyday situations.

• Buongiorno a tutti sounds warm, standard, and very common.
• Salve a tutti is also possible, but salve can sound a bit more neutral, slightly stiff, or less natural depending on the situation and region.

For many learners, Buongiorno a tutti is one of the safest greetings to use with a group.

Yes, but the tone changes.

• Buongiorno a tutti = more polite / neutral
• Ciao a tutti = more casual and friendly

So Ciao a tutti is great with friends, classmates, or informal videos, but Buongiorno a tutti is safer in formal or semi-formal situations.