die Injektion
injection
The introduction of a liquid, usually a medication, into the body using a syringe and a needle.
Der Arzt verabreichte dem Patienten eine Injektion gegen die Schmerzen.
The doctor gave the patient an injection for the pain.

injection
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injection
The introduction of a liquid, usually a medication, into the body using a syringe and a needle.
Der Arzt verabreichte dem Patienten eine Injektion gegen die Schmerzen.
The doctor gave the patient an injection for the pain.

'Injektion' (injection) belongs to the word family of the verb 'injizieren' (to inject). Both words come from Latin and contain the parts 'in-' (into) and '-jizieren' (to throw, inject).
Der Arzt musste dem Patienten ein Antibiotikum injizieren.
The doctor had to inject the patient with an antibiotic.
You can tell from the context whether the medical or technical meaning is intended. Words like 'Arzt' (doctor), 'Patient' (patient), 'Spritze' (syringe), or 'Impfung' (vaccination) point to medicine. Terms like 'Motor' (engine), 'Treibstoff' (fuel), or 'System' (system) point to technology.
Die Krankenschwester bereitete die Injektion vor.
The nurse prepared the injection.
In a medical context, 'Injektion' (injection) is often combined with the verbs 'geben' (to give), 'bekommen' (to get/receive), or the more formal 'verabreichen' (to administer).
Ich habe heute beim Arzt eine Injektion gegen Tetanus bekommen.
I got an injection against tetanus at the doctor's today.
shot
'Schuss' and 'Injektion' can both mean that a liquid enters the body through a needle. 'Injektion' is the precise and neutral word, especially in medicine and nursing care. 'Schuss' is colloquial for this and often sounds like drug use, not normal treatment at the doctor's office. So the words can refer to the same action, but they do not fit the same tone. With doctors, medications, and vaccinations, 'Injektion' or 'Spritze' is more natural; 'Schuss' should be avoided there.

Die Ärztin erklärt dem Patienten die Injektion genau.
The doctor explains the injection to the patient carefully.
Die Polizei fand Hinweise auf einen Schuss Drogen.
The police found evidence of a drug shot.