
die Erinnerung
memory
An image, a feeling, or information from the past that is stored in the mind.
Ich habe viele schöne Erinnerungen an meine Kindheit.
I have many beautiful memories of my childhood.
memory / reminder
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memory
An image, a feeling, or information from the past that is stored in the mind.
Ich habe viele schöne Erinnerungen an meine Kindheit.
I have many beautiful memories of my childhood.

memory
The brain's ability to store information and retrieve it again when needed; memory.
Im Alter lässt bei manchen Menschen die Erinnerung nach.
In old age, some people's memory declines.

reminder
A message that reminds someone of something they should do or should not forget; a reminder notice.
Sie haben eine Erinnerung erhalten, weil die Rechnung noch nicht bezahlt ist.
You have received a reminder because the invoice has not been paid yet.

keepsake
An object that you keep in order to remember a place, an event, or a person; a memento or souvenir.
Er hat eine Muschel als Erinnerung an den Urlaub am Meer mitgebracht.
He brought back a shell as a keepsake of the vacation by the sea.
The noun 'die Erinnerung' is derived directly from the verb 'sich erinnern' (to remember). The ending '-ung' is a typical way for German verbs to become feminine nouns.
Wenn du dich an etwas erinnerst, hast du eine Erinnerung daran.
When you remember something, you have a memory of it.
'Erinnerung' is almost always used with the preposition 'an' and the accusative. The structure is: 'die Erinnerung an jemanden/etwas' (the memory/reminder of someone/something).
Die Erinnerung an den letzten Sommerurlaub macht mich glücklich.
The memory of the last summer vacation makes me happy.
When referring to images stored in memory, 'Erinnerung' is often combined with verbs like 'wecken' (to awaken), 'wachrufen' (to call up), or 'haben' (to have). A very typical expression is also 'in Erinnerungen schwelgen' (to indulge in memories / to reminisce).
Alte Lieder können starke Erinnerungen wecken.
Old songs can awaken strong memories.
In an official or business context, 'Erinnerung' usually means 'Mahnung' (reminder notice/payment reminder). Signal words are verbs like 'schicken' (to send), 'bekommen' (to get), or 'erhalten' (to receive), often in connection with invoices or deadlines.
Ich habe eine Erinnerung erhalten, meine Bibliotheksbücher zurückzugeben.
I received a reminder to return my library books.
When 'Erinnerung' describes an object, the preposition 'als' is often used. The typical structure is 'etwas als Erinnerung an etwas behalten' (to keep something as a keepsake of something) or 'mitnehmen' (to take along).
Sie hat eine Postkarte als Erinnerung an ihre Reise nach Paris aufgehoben.
She kept a postcard as a keepsake of her trip to Paris.
memory
Both words relate to things from the past that are preserved in the mind. An Erinnerung is usually a specific image, feeling, or experience, whereas Gedächtnis refers more to the ability to store and recall such content. Use „Erinnerung“ for the individual content and „Gedächtnis“ for the mental ability.

Die Erinnerung an den ersten Schultag ist ihr besonders wichtig.
The memory of her first day at school is especially important to her.
Sein Gedächtnis funktioniert auch im hohen Alter noch sehr gut.
His memory still works very well even in old age.