Explain how serializers work in Django REST Framework and their role in data processing.

In Django REST Framework (DRF), serializers are responsible for converting complex data types (e.g., Django models) into simple formats (JSON, XML) for transmission over the network, as well as for the reverse conversion — from incoming data into Python objects.

Main functions of serializers:

• Data validation: check the correctness of incoming data.
• Data transformation: convert model objects into a format suitable for APIs (e.g., JSON).
• Creating and updating objects: based on valid data, create or update records in the database.

Example of a serializer:

from rest_framework import serializers
from myapp.models import Product

class ProductSerializer(serializers.ModelSerializer):
    class Meta:
        model = Product
        fields = ['id', 'name', 'price']

# Usage
serializer = ProductSerializer(product_instance)
json_data = serializer.data  # serialization

# Deserialization and validation
serializer = ProductSerializer(data=request_data)
if serializer.is_valid():
    product = serializer.save()