what are essential amino acids? from what source do you obtain essential amino acids?

Error: Message: unknown error: net::ERR_PROXY_CONNECTION_FAILED (Session info: chrome=135.0.7049.114) Stacktrace: #0 0x56154e9aa75a #1 0x56154e45d4b0 #2 0x56154e454593 #3 0x56154e444c69 #4 0x56154e44696d #5 0x56154e444ffe #6 0x56154e44499e #7 0x56154e44464f #8 0x56154e4424cf #9 0x56154e442c8a #10 0x56154e460949 #11 0x56154e4fb1f5 #12 0x56154e4d4592 #13 0x56154e4fa5e0 #14 0x56154e4d4363 #15 0x56154e4a0d63 #16 0x56154e4a19c1 #17 0x56154e96fa6b #18 0x56154e973951 #19 0x56154e957b62 #20 0x56154e9744c4 #21 0x56154e93c13f #22 0x56154e9986f8 #23 0x56154e9988d6 #24 0x56154e9a95a6 #25 0x7f9fc6933ac3