Upvote:1
Turkey issues multiple entry E-visas.
https://www.evisa.gov.tr/en/info/
If your visa is multiple entry (according to description you have provided, it is), you can enter multiple times in turkey.
6 months, 90 days means that you can stay upto 90 days on each entry for the validity mentioned.
Update: Since you are an Indian citizen, you are not eligible for multiple entry e-Visa.