required
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required
Describes something that is necessary or absolutely needed in order to achieve a specific goal or meet a condition.
Für die Einreise in dieses Land ist ein gültiges Visum erforderlich.
A valid visa is required to enter this country.
The adjective 'erforderlich' (required) is derived from the verb 'erfordern' (to require). If something requires a certain prerequisite, then that prerequisite is required.
Diese Arbeit erfordert viel Geduld.
This work requires a lot of patience.
'Erforderlich' (required) is very often used in the construction 'erforderlich für + accusative' (required for + accusative). This expresses what something is necessary for.
Gute Sprachkenntnisse sind für diesen Job erforderlich.
Good language skills are required for this job.
'Erforderlich' (required) belongs to formal language. You often find it in official documents, instructions, laws, or professional contexts.
Bitte bringen Sie alle erforderlichen Unterlagen zum Termin mit.
Please bring all required documents to the appointment.
necessary
'nötig' and 'erforderlich' both describe something that is needed for a goal or a condition. The difference is mainly in style. 'nötig' is more general and sounds natural in conversation. 'erforderlich' sounds more factual and is often used in forms, rules, instructions, or official information. In meaning, they are very similar here, but 'erforderlich' often feels more precise or more formal.
Für die Reise ist ein gültiger Pass erforderlich.
A valid passport is required for the trip.
Für die Anmeldung ist nur ein Ausweis nötig.
Only an ID is necessary for registration.