The base64 module comes pre-installed with Python 3, so you don't need to install it separately.

To use it in your Python code, you can simply import it like this:

```python
import base64
```
Once you've imported the module, you can use its functions to encode and decode data in Base64 format.

For example, to encode a string in Base64 format, you can use the b64encode() function like this:

```python
import base64

my_string = "Hello, world!"
encoded_string = base64.b64encode(my_string.encode('utf-8'))

print(encoded_string)
```
This will print the Base64-encoded string.

To decode a Base64-encoded string, you can use the b64decode() function like this:

```python
import base64

encoded_string = "SGVsbG8sIHdvcmxkIQ=="
decoded_string = base64.b64decode(encoded_string).decode('utf-8')

print(decoded_string)
```
This will print the decoded string.

You can also use the `b64encode()` and `b64decode()` functions to encode and decode binary data, such as images.
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