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This time, I'd like to create an article for those who are planning to buy a camera.
There are various types of cameras. The two main categories are "film cameras" and "digital cameras."
Many of you probably know the difference between these two.
I will explain the key points for choosing each type for those who are just starting out.
This time, we will focus on "digital cameras."

Digital Cameras

DSLRs

They have this traditional shape that has been around for a long time.

You can see their appearance as a serious camera.

Advantages of DSLRs

• Optical Viewfinder
  The biggest feature of DSLRs is their optical viewfinder, which allows you to compose your shot with no time lag, viewing the actual scene.
  This is effective for fast-moving subjects. You can press the shutter the instant you want to capture the shot.
• Extensive Lens Lineup
  Compared to mirrorless cameras, DSLRs have a longer history, so there's a wider variety of lenses available.
  Depending on the manufacturer, you can even use lenses from the film era, which expands your choices significantly.
• More Shots Per Charge
  When shooting with the viewfinder, the battery life is longer from a full charge.
• Focus on Shooting
  Shooting with the viewfinder and the solid weight provide an immersive experience, which is a great appeal.
• Older Models Can Be Purchased Cheaply Used
  Even models that were expensive when new might be found affordably on the used market.

Mirrorless Interchangeable-Lens Cameras

▲Type without a viewfinder
Compactly designed.

▲Type with an attachable external viewfinder

▲Type with built-in viewfinder
While their shape may resemble DSLRs, their size is significantly smaller.

Advantages of Mirrorless Interchangeable-Lens Cameras

• Lightweight and Compact
  They are designed to be relatively lightweight, making them easier to carry than DSLRs.
• Easier to Visualize the Shot Before Taking It
  Since you shoot while looking at the LCD screen, you can check exposure, color tones, and other settings as you shoot.
• Some Small Models Outperform DSLRs
  There are serious models with large sensor sizes and button layouts designed for professional use.
• Can Mount Various Lenses, Including Old Lenses, with Mount Adapters
  Due to their structure, mirrorless cameras have the potential to mount a wide variety of lenses from all eras using adapters.
  Shooting with old vintage lenses is also popular on social media (however, this is outside the manufacturer's warranty).

Summary

Whether you choose a DSLR or a mirrorless camera, you can take high-quality photos.

DSLRs offer professional shooting with their large grips and user-friendly button layouts on many models.

Mirrorless cameras range from entry-level to advanced, but their user experience can vary significantly.

It's expected that manufacturers will continue to focus on advanced mirrorless models, so cameras with a similar user experience to DSLRs will likely increase.

However, the advantage of a DSLR's optical viewfinder cannot be replicated, so it's unlikely to completely disappear.

It's best to choose a camera that suits your photographic interests, preferred user experience, and budget.

Addendum 2025

The market situation has changed considerably since this article was originally written. New DSLR models are hardly being released anymore, and mirrorless interchangeable-lens cameras have become the mainstream, with lineups ranging from flagship to entry-level models.
While I listed small size and light weight as advantages of mirrorless interchangeable-lens cameras, it's now sometimes the case that high-end mirrorless cameras are larger.
Those who want to buy a new camera and start photography will find that most options are mirrorless interchangeable-lens cameras. In the used market, you can find DSLRs, compact cameras, and mirrorless interchangeable-lens cameras, offering a wide range of choices to find what suits you.