**Example**:
```python
from pyspark.sql import SparkSession
from pyspark.sql.types import StructType, StructField, StringType, IntegerType
schema = StructType([
StructField("id", IntegerType()),
StructField("name", StringType()),
])
df = spark.createDataFrame([], schema)
# Or DDL: spark.createDataFrame([], "id int, name string")
```
**Why it matters**: Empty DataFrame with schema enables downstream operations without data; used for union, schema validation....
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