nvcc does: NVIDIA's CUDA compiler that produces PTX and SASS

SASS is: the actual machine code that runs on NVIDIA GPU hardware

SASS: compiled machine code executing on NVIDIA GPU hardware

Parallel Thread Execution

PTX is an intermediate GPU instruction set used in Nvidia's CUDA

a Triton kernel is

Triton kernel: Python-based GPU programming that compiles to PTX

CUDA

CUDA enables parallel computation on GPUs

Triton differs from CUDA

Triton uses block-level programming, while CUDA uses thread-level programming

TensorRT does: NVIDIA's inference optimizer that quantizes and fuses operations

TensorRT optimizes deep learning inference by quantizing and fusing operations for NVIDIA GPUs