Used specifically in poker games to signify the initial contribution to the pot. Before the cards were dealt, everyone placed their ante.
Pro Tip 2/3
Gambling Context
Understand that 'ante' is commonly used in gambling settings, not just poker. The blackjack table has a $10 ante.
Pro Tip 3/3
Metaphorical Use
'Ante' is also used metaphorically to mean increasing one's investment in a non-gambling context. The company upped the ante by investing in new technology.