Casio is a well-known manufacturer of digital pianos, keyboards, and electronic musical instruments. They offer a wide range of digital pianos suitable for musicians of all levels, from beginners to advanced players. Here are some key features and models associated with Casio digital pianos:

1. Weighted Keys: Many Casio digital pianos come with weighted keys to replicate the feel of an acoustic piano. This is especially important for pianists who want to practice and perform on a digital instrument that closely mimics the touch of a traditional piano.

2. Sound Quality: Casio digital pianos are known for their high-quality sound sampling. They often incorporate advanced technology to reproduce the rich and nuanced tones of acoustic pianos.

3. Polyphony: Casio digital pianos typically offer a range of polyphony (the number of notes a digital piano can produce simultaneously). Models vary in their polyphony capabilities, with some offering up to 256-note polyphony for complex musical arrangements.

4. Built-in Sounds: Casio digital pianos often include a variety of built-in sounds and instruments, such as grand pianos, electric pianos, organs, strings, and more. This versatility makes them suitable for various musical genres.

5. Touch Sensitivity: Most Casio digital pianos have adjustable touch sensitivity settings. This allows players to customize the responsiveness of the keys to their playing style.

6. Connectivity: Casio digital pianos may come with various connectivity options, including USB ports for connecting to computers, MIDI compatibility, headphone jacks, and audio inputs/outputs.

7. Portability: Some Casio digital pianos are designed to be portable, making them a good choice for musicians who need to transport their instrument or perform in different locations.

8. Learning Features: Many Casio digital pianos are equipped with educational features like built-in lessons, metronomes, and recording capabilities to help beginners and students improve their playing skills.

Popular Casio digital piano series and models include:

• Casio Privia: Known for its slim design and realistic piano sound, the Privia series includes models like the PX-S1000 and PX-160.

• Casio Celviano: This series offers digital pianos with a more traditional furniture-style appearance, such as the AP-470 and AP-270.

• Casio CDP Series: These are compact and affordable digital pianos like the CDP-S100 and CDP-135, designed for beginners and casual players.

• Casio Grand Hybrid: The Grand Hybrid series, including models like the GP-300 and GP-500, is a collaboration with Bechstein, a renowned acoustic piano manufacturer, and offers a more authentic grand piano experience.

When choosing a Casio digital piano, consider your skill level, budget, and specific requirements to find the model that suits you best. It's also a good idea to try out different models in person to get a feel for their sound and playability before making a purchase.