Shaders are one of the best examples of good Minecraft mods. They change how the game looks, and introduce a visual experience similar to that of playing with ray rracing.

Minecraft guide to use shaders with Distant Horizons mod 128 chunks render distance (Image via Mojang) Chart New Territories with the ultimate Minecraft Seed Generator!

For Iris Shaders (for modern visuals and fabric users), go to the Iris Shaders page— https://irisshaders.net, download the Fabric version for 1.21.5, and then install it using the Fabric mod loader.

Here is a step-by-step comprehensive guide on how you can download, install, and use the shaders within Minecraft 1.21.5 to ensure the best visual experience.