Hey guys, I want to know what structural unemployment means everyone talking about it

I am currently 3rd year computer science student who is actively searching internship in Singapore as the foreigner who is studying in Malaysia. I have to admit that I dont possess a good grade but I am just thinking whether there exists possibility for me to do so. I choose Singapore due to the opportunities provided for computer science like me. I understand I can't apply for Work Holiday Pass but is there any way for me to do internship there?

I am a marketing executive who are looking to learn more about digital marketing as well as to improve my creativity on content. May I get any advice from the mentors in this platform as to how I can start? Thanks in advance.