If you're wondering why people are protesting:
Trump’s presidency isn’t final. Candidates do not actually recieve electoral college votes until December 19 when appointed individuals (called electors) vote, which finalizes the presidency. Electors generally vote the way their state suggests, but they are only obligated to do so in 26 states. The electors can choose to cast their votes for any candidate. There’s more that happens should they choose to vote for someone besides the majority suggestion, but the point is that nothing is final until December.