"Any institution's Alumni are key to its growth".

Once you graduate from a university, you are always a part of its alumni network. If you want to support scholarship programs, attend alumni-only events, or get access to special discounts, you may need to officially join your alumni association, which usually involves a simple application and annual fee. Contributions go toward hiring staff, hosting events, and offering scholarships.
There are three main reasons you will want to be active in your alumni network :

1. PROFESSIONAL NETWORKING AND CAREER OPPORTUNITIES

From CEOs to entry-level coordinators, everyone who graduated from college is an alum. Looking for a job or mentor? Want to find a good financial advisor? It might be a fellow alum. With the mention of a funny campus anecdote or a popular professor, a near stranger may become your introduction to a hiring manager or trusted retirement.
A few examples of how you can connect with your fellow graduates :
Alumni association message board
LinkedIn, which allows you to filter and search by university and see where LinkedIn members work, what industries they are connected to Facebook groups
Events and social mixers organized on sites
Homecoming, graduation, and other on-campus events
Most universities offer career services to alumni, too.
Some examples are:
Resume and Interview prep courses
Mentoring programs
start-up workshops and grants
Workplace alumni days
Job posting boards with exclusive listings
Shadow opportunities and informational interviews
Continuing education courses

2. COMMUNITY AND EVENTS

Keeping in touch with your fellow alumni includes connections beyond the workplace, too. If you stay connected online, you will be invited to alumni-only happy hours in your city, networking lunches, volunteering events, and fundraisers for local charities. You may meet your next business colleague or lifelong friend at an alumni event.

3. EXCLUSIVE DISCOUNTS AND PERKS

Joining your alumni association can also mean saving a few dollars or getting access to exclusive perks. Alumni groups encourage association sign-ups by offering a range of member-only offerings, products, and services like:

lifelong learning courses
fee-free bank accounts