If you wish to travel to Spain for any purpose, you will first need to obtain a visa. There are many ways to apply for a Spain visa, and the process can vary depending on your nationality and the validity of your passport.
To begin the visa application process, you will need to gather all of the following information:
Your passport information (name, date of birth, etc.)
Photocopy of your passport pages containing your visa application information (front and back)
A letter of invitation from a personal or business contact in Spain
Proof of adequate funds (bank statement, proof of payment for tour tickets, etc.)