find():

• Returns a cursor to all matching documents
• Returns multiple documents
• Lazy evaluation - documents loaded as needed
• Can be chained with other methods

findOne():

• Returns the first matching document
• Returns a single document object or null
• Immediately executes and returns result
• Cannot be chained with cursor methods

// find() - returns cursor
const cursor = db.users.find({age: {$gte: 25}})
cursor.forEach(doc => print(doc.name))

// findOne() - returns document
const user = db.users.findOne({email: "john@email.com"})
if (user) {
  print(user.name)
}