Who funds NASA?

Could you elaborate on the question of who funds NASA? Given that NASA is a government agency within the United States, I'm curious about the various sources of funding that support its operations and research. Does NASA primarily rely on federal appropriations from Congress? Are there any private or corporate partnerships that contribute significantly to NASA's budget? And how does NASA's funding affect its ability to conduct missions, both within Earth's orbit and beyond? Understanding the financial backing of NASA seems crucial to appreciating the scope and impact of its work.