Startup capital is the funding that helps you launch your business for the first year or so of operation. Typical sources include your own funds and angel investors.
Mezzanine capital is also known as expansion capital and is funding to help your company grow to the next level. Mezzanine capital usually comes from angel investors, private equity and venture capital.
Bridge funding is named for the fact that it bridges the gap between your current financing and the next level of financing. Typical sources include all options - angel investors, venture capital, private equity, etc.
Funding for all cycles of your business
Seed capital helps you do your initial research and planning for your business. Typical sources include your own funds, angel investors, friends & family.