
geboten
required
Necessary, appropriate, or advisable in a particular situation.
Angesichts des schlechten Wetters ist besondere Vorsicht geboten.
In view of the bad weather, special caution is required.
required / offered
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required
Necessary, appropriate, or advisable in a particular situation.
Angesichts des schlechten Wetters ist besondere Vorsicht geboten.
In view of the bad weather, special caution is required.

offered
Used as an adjective to describe something that was offered or made available. It is the past participle of the verb 'bieten' (to offer).
Er ergriff die gebotene Gelegenheit, um seine Idee vorzustellen.
He seized the offered opportunity to present his idea.
'Geboten' is the past participle of the verb 'bieten' (to offer) or of the less common verb 'gebieten' (to command, require). The different meanings are derived from these two origins.
Er hat mir seine Hilfe geboten.
He offered me his help.
The meaning depends on the word's position in the sentence. If 'geboten' comes at the end of the sentence after 'ist' (is) or 'scheint' (seems), e.g., 'Vorsicht ist geboten' (caution is required), it means 'required.' If it comes before a noun, e.g., 'die gebotene Chance' (the offered opportunity), it means 'offered.'
In dieser Situation ist Geduld geboten. (erforderlich)
In this situation, patience is required. (required)
The meaning 'required' or 'advisable' almost always appears in the fixed structure '[noun] ist geboten' ([noun] is required). The noun is in the nominative case.
Bei Glatteis ist höchste Vorsicht geboten.
In icy conditions, the utmost caution is required.
In the meaning 'offered,' 'geboten' is often combined with nouns that describe an opportunity or advantage. Typical examples are 'die gebotene Chance' (the offered chance), 'die gebotene Gelegenheit' (the offered opportunity), or 'die gebotene Hilfe' (the offered help).
Er nahm die gebotene Hilfe dankend an.
He gratefully accepted the offered help.
necessary
Notwendig and geboten can both justify an action in a particular situation. Notwendig means that the action is genuinely required, whereas geboten can also express that it is merely appropriate or advisable. Choose „notwendig“ when something is truly required and „geboten“ when the situation mainly suggests an appropriate response.

Nach dem Missverständnis war es geboten, ruhig miteinander zu sprechen.
After the misunderstanding, it was appropriate to talk to each other calmly.
Wegen des starken Regens war es notwendig, das undichte Fenster zu reparieren.
Because of the heavy rain, it was necessary to repair the leaky window.