# Materialization

### Materialization

`push` uploads the entries in a data package to a remote registry, performs the tophash calculations, and stores a package manifest referencing the remote files in the remote registry.

This is known as **materialization**, and it means that `push` creates **materialized packages**: packages which point solely to files located in an Amazon S3 bucket.

### Pushing unmaterialized packages

There are advanced use cases where automatically copying (potentially large) files is not the behavior you want.

To push an *unmaterialized* file to a remote registry, use `build` with a `registry`. For example:

```python
import quilt3
p = quilt3.Package().set("example.csv", "example.csv")
p.build("username/packagename", registry="s3://my-bucket")
```

Note that in this case it is up to you, the package author, to ensure that any local files in the package remain available and accessible to users.


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