Okay, well it's hard to explain briefly but pretty much in short, it's an online cricket management game.
When you sign up, you choose your squad name and pretty much, you're given a squad of players, that make up your senior and youth squad. All your players are pretty average though so most of them will be fired within your first season or playing.
Each player has a batting skill, bowling skill, technique skill (essential for everyone, and usually should be the same level or one level higher or lower than the primary), fielding skill, endurance level and power level (fielding and endurance pretty straight forward, power pretty much means bowlers are more likely to take wickets by bowling a quicker delivery and means batsmen are more likely to score quicker). And then there are experience levels and captaincy level. All skills are improved through training (a variety of training programs that each player is set to by yourself). Experience is improved through playing matches, while captaincy improves but only very slowly and only when a player is captaining.
So really, you improve your squad through training and by the transfer market system, where managers list players no longer needed and can be bought by other managers in a bidding war.
And your team plays in a pyramid league structure, with 3 separate competitions. Youth One Day (40 over league), Senior Twenty20 League and Senior One Day (50 over league). Top team in each league is promoted with the goal being to get to Division 1 and then winning the top division. Each countries have different league structures so there's also a world ranking based on the strength of each squad (also nation ranking given).
So yeah, that's a basic overview, if you want more, then just sign up and have a look around
From the Pavilion - Free Online Cricket Management Game