From where does the ldd command retrieve dependency information?

Question

Kindly bare if the question is very basic. ldd command displays the dependent libraries over the executable file is what i know. In executable file, where these information is kept?.

Answer 1

This is stored in the .dynamic section of the ELF executable. See ELF-64 Object File Format, starting on page 14 (Dynamic Tables):

Dynamically-bound object files will have a PT_DYNAMIC program header entry. This program header entry refers to a segment containing the .dynamic section, whose contents are an array of Elf64_Dyn structures.