Engagement is the stage wherein you agreed to marry your partner. This will lead to marriage. Becoming a fiancé is one grateful thing. It is where you and your partner are unofficially married but will becoming as one in the near future.
Some people still celebrate engagements. There are several ways of performing it and it depends in their culture sometimes. Some don’t and a simple proposal to your partner is enough. A diamond ring is the most common symbol for engagement.
Think of your decision thoroughly as marriage is a lifetime commitment.