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# Input/Output
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File I/O operations supporting HDF5 and CSV formats with full metadata preservation.
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## Capabilities
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### HDF5 Operations
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Functions for reading and writing HDF5 files with complete scipp metadata support.
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```python { .api }
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def load_hdf5(filename):
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    """
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    Load data from HDF5 file
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    Args:
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        filename (str): Path to HDF5 file
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    Returns:
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        Variable or DataArray or Dataset: Loaded data
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    """
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def save_hdf5(data, filename):
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    """
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    Save data to HDF5 file
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    Args:
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        data (Variable or DataArray or Dataset): Data to save
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        filename (str): Output file path
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    """
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```
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### CSV Operations
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Functions for reading CSV files into scipp data structures.
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```python { .api }
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def load_csv(filename, **kwargs):
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    """
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    Load data from CSV file
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    Args:
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        filename (str): Path to CSV file
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        **kwargs: Additional arguments for CSV parsing
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    Returns:
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        DataArray: Loaded data with inferred structure
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    """
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```