The finances to be dealt with by court split into child support (where relevant), alimony, and marital assets. In a nutshell, marital assets are subject to division, typically up to half half, with  factors such as longevity of marriage and contribution (tangible or intangible) considered in the final determination. The split is usually as a one-off distribution. Live in the USA, and it is probable that your assets will be divided up, but live in a Community State rather than a Common Law State, and it is even more probable and more divided. That is the essence, but the minutiae are so lengthy that the general rule rarely results without adaptation.

For those who can keep abreast of financial implications, ensure that all pre marital assets are strictly defined, remain separate at all times, and beyond involvement of the owner. Earning interest on a bank account is one thing, but continuously and personally trading to earn higher returns is another. That would be considered active management, and the profits (at the least) would be subject to division. Legal terms such as transmutation and co-mingling abound, especially in  Common Law States (New York for example), and will trip you up without expert knowledge. More detail will be provided, but for here, suffice to say, don’t presume without consultation of a reference work or an attorney.

_{THIS INFORMATION IS OF GENERAL NATURE ONLY AND NOT TO BE RELIED UPON IN ANY SPECIFIC SITUATION. IN ALL CASES CONSULT AN ATTORNEY FOR PROPER ADVICE}