Export Segmentation

Operating system: Windows 10
Slicer version:3D Slicer 4.11.20200930
I am very new to the 3D slicer software. I need support to decide which format should I export the segmentation if I need to train the 2D slice with the segmentation to extract the features.
I would prefer to export the segmentation in the .csv format.
Can I get some guidance on how can I proceed?
Thanks in advance

CSV format for storing an image would be extremely inefficient (probably reading the file would take 100x longer time than reading it from a binary file format). For saving an save preprocessed (resample, cropped, aligned, etc.) segmentations for AI training, you can use .npy (numpy save).

For archiving - permanent storage of the segmentation and images, preserving all essential metadata - I would recommend .nrrd (for sharing between projects within the same group) or DICOM (for sharing between different institutions).

I tried using .nrrd file format and it was really useful and server my purpose.
Thanks a lot for the support.

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