Hello there!

The basic difference is this that summers internship lasts in summer season and winter Internship lasts in winter season.

Summer internship start in June and lasts for 2-3 months and winter Internship starts in November or December and it also lasts for 2-3 months.

You can pursue any of these Internship, it completely depends on your schedule and interests.

Hope it helps.

Stay safe.

All the best !!