The placement of something or someone is the act of putting them in a particular place or position.

If someone who is training gets a placement, they get a job for a period of time which is intended to give them experience in the work they are training for.

The placement of someone in a job, home, or school is the act or process of finding them a job, home, or school.

You can refer to a home that is found for someone who is unable to look after themselves, for example a child, as a placement .