Why do unon contracts protect workers who have seniority?

Union contracts protect workers with seniority by establishing clear guidelines for job security, promotions, layoffs, and benefits based on tenure. These agreements often include provisions that prioritize senior employees during layoffs or when filling open positions, ensuring they are treated fairly. Additionally, seniority can lead to better wages and working conditions as unions negotiate on behalf of their members. This system helps create a more equitable work environment and rewards loyalty and experience.