"Rain shoes" usually refer to shoes designed for wearing in rainy or wet conditions. These shoes typically have waterproof or moisture-resistant features that can effectively prevent water from penetrating into the shoes and keep feet dry.

Some common types of rain shoes include:

1. Rain boots: High, mid, or ankle-length waterproof boots that are typically worn in heavy rain or on wetlands.

2. Rain shoes: Shoes similar to ordinary shoes, but with a special waterproof or moisture-resistant coating, suitable for wearing in light rain.

3. Rubber shoes: Made of rubber material, with full waterproof performance, often used for walking on muddy ground.

Overall, rain shoes usually have waterproof, moisture-resistant, and slip-resistant features that make them more comfortable and safe to wear in wet conditions.

"Outdoor waterproof shoes," on the other hand, are shoes designed for wearing during outdoor activities, with a focus on waterproof and durability features. They are suitable for hiking, trail running, and other outdoor activities. These shoes are typically more sturdy and can be worn in different terrains and weather conditions.

Although there are some similarities between "rain shoes" and "outdoor waterproof shoes," their designs and purposes are different. When buying shoes, it is important to choose the right shoes based on specific use cases and needs.