Basic JavaScript - Record Collection

I don’t understand what they mean by setting prop to value.
What do they mean when they say "update or set that albums prop to value?

Your code so far

// Setup
const recordCollection = {
  2548: {
    albumTitle: 'Slippery When Wet',
    artist: 'Bon Jovi',
    tracks: ['Let It Rock', 'You Give Love a Bad Name']
  2468: {
    albumTitle: '1999',
    artist: 'Prince',
    tracks: ['1999', 'Little Red Corvette']
  1245: {
    artist: 'Robert Palmer',
    tracks: []
  5439: {
    albumTitle: 'ABBA Gold'
if(prop!=tracks && value != " "){

// Only change code below this line
function updateRecords(records, id, prop, value) {
  return records;

updateRecords(recordCollection, 5439, 'artist', 'ABBA');

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Challenge: Basic JavaScript - Record Collection

Link to the challenge:

the word value here refers to the parameter value
function updateRecords(records, id, prop, value) {

This function can be called as follows:
updateRecords(recordCollection, 5439, "artist", "ABBA")

So in this case, the value parameter is “ABBA” and they want you to add that to the given prop “artist” in the record identified by 5439 inside the recordCollection.