How objdump disassemble elf binary

I have a quick question. I have generated a ELF binary from a c code using following code: gcc -o simple simple.c Then I do objdump for that ELF binary: objdump --disassemble-all simple I have checked my directory with ls -a that there is no .o file there. My question still how objdump show me the full disassemble code? Does objdump do static analysis in the binary to cover all the code?