Questo collegamento è pericoloso.

Questo means this.

It is questo because collegamento is a masculine singular noun, and Italian demonstratives must agree with the noun they describe.

So:

• questo collegamento = this link/connection
• questa connessione = this connection (if the noun is feminine)

A useful pattern is:

• questo = masculine singular
• questa = feminine singular
• questi = masculine plural
• queste = feminine plural

Collegamento can mean several related things, depending on context:

• connection
• link
• connection between things
• sometimes transport link or communication link

In modern everyday use, it can also mean an internet link or web link. So this sentence could mean something like This link is dangerous or This connection is dangerous, depending on the situation.

The accent is important because è means is.

Without the accent, e means and.

So:

• è = is
• e = and

That little accent helps distinguish two very common words.

È is the third person singular form of the verb essere, which means to be.

So:

• io sono = I am
• tu sei = you are
• lui/lei è = he/she is

In this sentence, collegamento is singular, so Italian uses è = is.

Because pericoloso is an adjective describing collegamento, and in Italian many adjectives commonly come after the noun.

So:

• un collegamento pericoloso = a dangerous link/connection
• Questo collegamento è pericoloso = This link/connection is dangerous

That word order is very normal in Italian.

Because pericoloso must agree with collegamento, which is masculine singular.

Agreement works like this:

• collegamento pericoloso = masculine singular
• connessione pericolosa = feminine singular
• collegamenti pericolosi = masculine plural
• connessioni pericolose = feminine plural

So the ending changes to match the noun.

You could, but it would sound unusual and marked in normal conversation.

The neutral, natural order is:

• Questo collegamento è pericoloso.

If you change the order, you usually create emphasis or a more dramatic/literary tone. A learner should generally stick with the standard version unless there is a special reason to emphasize something.

It is pronounced roughly like:

kol-leh-gah-MEN-to

A few helpful notes:

• the stress is on men
• gli is not present here, so it is not the special sound you hear in famiglia
• the g is a hard g sound, like in go, because it comes before a

So the word breaks down roughly as:

col-le-ga-men-to

Yes, absolutely. In modern Italian, collegamento is often used for a link, including a web link.

So in a computer or internet context, Questo collegamento è pericoloso would very naturally mean:

• This link is dangerous

For example, a browser warning or security message might use this kind of wording.

No article is missing.

The sentence is complete as it is:

• Questo collegamento = the subject
• è = the verb
• pericoloso = the adjective describing the subject

Italian, like English, can use to be + adjective directly:

• Il cane è grande. = The dog is big.
• La stanza è fredda. = The room is cold.
• Questo collegamento è pericoloso. = This link is dangerous.

You would only need another noun if you wanted a different structure, such as:

• Questo collegamento è un pericolo. = This link is a danger. / This link is dangerous.

But that is a different sentence pattern.

Yes, and in fact that is normal. Italian often omits subject pronouns like it, he, or she when the meaning is already clear from the verb or from the noun present.

In this sentence, the subject is already explicitly stated as Questo collegamento, so no extra pronoun is needed.

Italian would not normally say something like:

• Questo collegamento esso è pericoloso

That would sound wrong. The noun itself already does the job of the subject.