PCT Filing
Gives you a global filing date and defers the high costs of national filings for up to 30 months.
The Patent Cooperation Treaty (PCT) allows you to file a single international application and reserve rights in many countries. It gives you a global filing date and up to 30 months to decide where to enter national filings.
I recommend PCT filings if patents are a core part of your business. Otherwise, skip it, because filing national applications is very expensive.