You will need a visa if you are staying in Turkey for more than 90 days or if you plan to work or study in Turkey. This article provides an overview of the different visas and their requirements.
In the broadest sense, Turkey visas are either single entry (single entry) or multiple entry (multiple entries). Tourist visas and border visas (visas that citizens of many countries can obtain at points of entry) are generally valid for a single entry. However, work and student visas can cover multiple entries.

Visas are issued to cover certain activities in both categories. To apply for a visa, you need to make a suitable application at a Turkish embassy or consulate in your country. The general application procedure is listed below:
• Passport (Must be valid for 90 days longer than the requested visa.)
• Application form (via Ministry of Foreign Affairs)
• Two passport size photos
• Invitation or employment letter
• Proof of health insurance
• A financial proof of purchase of a return ticket or return ticket.
• Proof that you have the financial means to support yourself during your stay
• Visa processing fee (varies depending on visa type and nationality.)
• In addition to the specific requirements listed for this visa, you must prepare all these items regardless of the visa you need.

These visas are issued to travelers who are not eligible for a visa at their point of entry (such visas are also considered tourist visas). A tourist visa is issued for up to 90 days and is valid for a single entry. If you are purchasing a visa at the border, you will not be allowed to leave Turkey and re-enter Turkey without obtaining a new visa. Tourists who qualify for a visa at the Turkish border can also apply for their visa to a Turkish consulate or embassy in their home country.

Business visas are similar to tourist visas, but are issued to travelers visiting Turkey for temporary work (meetings, conferences, seminars). Like a tourist visa, a business visa is usually issued for up to 90 days and is valid for a single entry. If you need a work visa, you will need proof of your work in Turkey. Your employer should be able to provide you with a suitable letter or document.

Students can only apply for this visa after enrolling in a Turkish university, school or language class recognized by the Ministry of National Education. To apply for a student visa, you must receive a letter from your school proving your enrollment (this replaces an invitation letter or job application).
You must register with the Foreign Office of your local police department within 30 days of arriving in Turkey. After registration, you will be issued a residence permit.
Student visas and residence permits allow unlimited exit and entry as long as they are valid (usually around a year). You must make the necessary arrangements to renew your visa and obtain permission before it expires. Otherwise, there will be a risk of illegal residence.

If you want to live in Turkey longer than your visa exemption period or tourist visa, you must apply for a residence visa. Submit the required application materials to the Turkish embassy or consulate at least two months before your departure to allow sufficient time for the process. You cannot work in Turkey if you have a residence visa, so take special care to show that you can support yourself financially during your stay.

Apply for a work visa at the Turkish embassy or consulate at least 2 months before your departure. At the same time, your employer is required to send some documents to the Ministry of Labor and Social Security (MoLSS). The Ministry publishes an updated list of these documents on its website.
The process starts with the simultaneous work visa and work permit, after the necessary documents and forms are submitted in the application. The Ministry of Labor and Social Security will process your application within 90 days.
After your application is approved, you will need to pay the work permit and work visa processing fees.
As with a student visa, you must apply for a residence permit within 30 days of your arrival in Turkey. You will not be allowed to start work until you have obtained all three required permits.