If you want the plants inside to survive longer than a few weeks, yes. Sadly, many companies sell planters without drainage holes already drilled.
With the right power drill attachment, it’s easy to drill drainage holes into most pot materials. But the easiest solution will always be to check every planter for a drainage hole before buying.
To make things even more complicated, some pre-drilled drainage holes are too small. These will become clogged with soil and drown your plant’s roots. Use the same technique as above to make the holes larger before using these planters for container planting.