Internships and temporary roles are one of the most reliable back doors into a foreign job market, because they lower the employer's risk. Nobody has to commit to sponsorship or a permanent contract to find out whether you are good, and once you have proven yourself, converting a temp into a permanent hire is the path of least resistance. Local experience and references, however brief, also transform how your CV reads everywhere else.
Do they lead to long term roles? Often, but not automatically. Conversion is most common in fields with genuine shortages and in companies that use internships as a recruiting pipeline rather than cheap labour. Ask directly in interviews how often interns are retained; the answer is usually honest.
Guard the practical side: make sure your visa permits the role, be cautious about long unpaid arrangements, and treat every stint as an extended interview, building relationships you can activate later even if that company never hires you.