In TS EAMCET, the region (AU, SVU, or NL) matters for admission, as it determines the eligibility for reservation of seats in certain colleges. The AU (Osmania University) region is for candidates who have studied in Telangana or Andhra Pradesh, while the SVU (Sri Venkateswara University) region is for candidates from Rayalaseema. The NL (Non-local) category includes candidates from other states. The classification affects your eligibility for both local and unreserved seats in different institutions, so it's important to check the eligibility criteria for each college.