Is a gap year bad for an Indian microbiology graduate's master's applications to European universities, and how should it be used?

A gap year is not inherently damaging to a master's application, what matters is whether it was used productively and whether you can describe it specifically and credibly in the SOP. A gap year during which nothing substantive happened is genuinely difficult to explain, and admissions committees reading thousands of applications will notice when an SOP is vague about a period between degrees. A gap year used for online bioinformatics or computational biology courses, research work, industry experience, or building a meaningful project is a positive addition to the application, it shows self-direction and continued development outside a formal academic environment.

• The practical advice is to treat the gap year as a CV line rather than a gap: decide what you will do with it before it starts, document it as you go, and be ready to discuss it specifically in the application.
• Even a gap year that was not planned productively can be partially recovered if you use the remaining time before applications to build something specific, a certification, a project, or a volunteer role, that gives you material to reference.