furnish
To provide what is needed, like furniture or information.
To furnish something means to supply or provide what's needed. When you furnish information to your teacher, you give them the facts they asked for. When a witness furnishes evidence in court, they provide proof that helps solve a case.
The word most commonly describes filling a room or building with furniture. When a family furnishes their new apartment, they add beds, tables, chairs, and everything else needed to make the space livable and comfortable. A furnished apartment comes with furniture already in it, so you can move in without bringing your own couch or dining table.
Notice the connection: whether you're furnishing a room with chairs or furnishing a friend with directions, you're providing what's missing or needed. The word suggests completing something, making it ready for use. A scientist might furnish colleagues with research data. A hotel furnishes guests with towels and toiletries. When you furnish someone with an explanation, you're giving them the understanding they need.