Usted is Spanish and not used in Portugal but both came from the Latin base of tu and vos which permeates many indo-european languages (even English to some extent)..

https://en.wikipedia.org/wiki/T%E2%80%93V_distinction

In Peninsular, Mexican, and Peruvian Spanish, as in Italian, an original tú and vos usage similar to French disappeared in the Early Modern period. Today, tú is used for informal and familiar address while the respectful form is the third-person usted, which can be used respectfully to anyone. Scholars argue that usted evolved as a contraction of the Old Spanish Vuestra Merced ("your mercy"), with vusted as a transitional form. In some cases, the title Don is also employed when speaking to a respected older man, while Doña is used for older women.

In Portugal it is more like the French with "tu" being the familiar (used more and more frequently in EP) and "você" the more formal (except você is not really expressed either in Portugal as that is mostly a Brazilian treatment, so the Portuguese will use your name, title, occupation, or a menina for example rather than você).

https://en.wikipedia.org/wiki/T%E2%80%93V_distinction#Portuguese

European Portuguese
In European Portuguese (as well as in Africa, Timor-Leste and Macau), tu (singular "you") is commonly used as the familiar addressing pronoun, while você is a general form of address; vocês (plural both of tu and você) is used for both familiar and general. The forms o senhor and a senhora (plurals os senhores and as senhoras) are used for more formal situations (roughly equivalent to "Mr/Sir" and "Mrs/Madam".) Similarly to some Romance languages (e.g. Italian), tu can be omitted because the verb ending provides the necessary information. Not so much so with você or o senhor / a senhora because the verb ending is the same as for the third person (historically, você derives from vossa mercê ("your mercy" or "your grace") via the intermediate forms vossemecê and vosmecê). The second person plural pronoun vós, from Latin vos, is archaic in most of the Portuguese-speaking world, but can be heard in liturgy and has a limited regional use.

The Brazilian Portuguese treatment explanation is below the above at the Wikipedia link.

Almost comically, in much of Brazil this T-V Distinction has switched with "você" used almost exclusively in many regions (though not the south or the north I have been reading from those who live there so it is still good to learn) and now many Brazilians believe "tu" is more formal.

"Tu" is not much different from the English "you" and while "você" is also "you" it is conjugated in the 3rd person detachment almost like you might talk to royalty (would his highness like his bed turned down this evening?).